- Failure of F-purity and F-regularity in certain rings of invariants,
Illinois Journal of Mathematics 42 (1998), 441-448.
- A computation of tight closure in diagonal hypersurfaces,
Journal of Algebra 203 (1998), 579-589.
- Tight closure in non-equidimensional rings,
Communications in Algebra 26 (1998), 3969-3983.
- Deformation of F-purity and F-regularity,
Journal of Pure and Applied Algebra 140 (1999), 137-148.
- F-regularity does not deform,
American Journal of Mathematics 121 (1999), 919-929.
- Separable integral extensions and plus closure,
Manuscripta Mathematica 98 (1999), 497-506.
- Q-Gorenstein splinter rings of characteristic p are F-regular,
Mathematical Proceedings of the Cambridge Philosophical Society 127 (1999), 201-205.
- Multi-symbolic Rees algebras and strong F-regularity,
Mathematische Zeitschrift 235 (2000), 335-344.
- Veronese subrings and tight closure,
Pacific Journal of Mathematics 192 (2000), 399-413.
- Intersection multiplicities over Gorenstein rings, with Claudia Miller,
Mathematische Annalen 317 (2000), 155-171.
- p-torsion elements in local cohomology modules,
Mathematical Research Letters 7 (2000), 165-176.
- Relative test elements for tight closure,
Journal of Pure and Applied Algebra 158 (2001), 101-109.
- p-torsion elements in local cohomology modules II, in: Local cohomology and its applications (Guanajuato, 1999),
Lecture Notes in Pure and Applied Mathematics 226 (2002), 155-167.
- Todd classes of affine cones of Grassmannians, with Kazuhiko Kurano,
International Mathematics Research Notices 35 (2002), 1841-1855.
- Cyclic covers of rings with rational singularities,
Transactions of the American Mathematical Society 355 (2003), 1009-1024.
- Associated primes of local cohomology modules,
in: Proceedings of the 48th Algebra Symposium, Nagoya University (2003), 133-145.
- Associated primes of local cohomology modules and of Frobenius powers, with Irena Swanson,
International Mathematics Research Notices 33 (2004), 1703-1733.
- The F-signature of an affine semigroup ring,
Journal of Pure and Applied Algebra 196 (2005), 313-321.
- On the arithmetic rank of certain Segre products, with Uli Walther,
Contemporary Mathematics 390 (2005), 147-155.
- Twenty-four hours of local cohomology, with Srikanth Iyengar, Graham Leuschke, Anton Leykin,
Claudia Miller, Ezra Miller, and Uli Walther, AMS Graduate Studies in Mathematics 87, 2007.
- Annihilators of local cohomology in characteristic zero, with Paul Roberts and V. Srinivas,
Illinois Journal of Mathematics, Special Issue in Honor of Phil Griffith, 51 (2007), 237-254.
- Local cohomology and pure morphisms, with Uli Walther,
Illinois Journal of Mathematics, Special Issue in Honor of Phil Griffith, 51 (2007), 287-298.
- Divisor class groups of graded hypersurfaces, with Sandra Spiroff,
Contemporary Mathematics 448 (2007), 237-243.
- A connectedness result in positive characteristic, with Uli Walther,
Transactions of the American Mathematical Society 360 (2008), 3107-3119.
- Tight closure: applications and questions, in: Proceedings of the 4th Japan-Vietnam Joint Seminar on
Commutative Algebra, February 17-21, 2009, Meiji University (2009), 45-63.
- Multigraded rings, rational singularities, and diagonal subalgebras, with Kazuhiko Kurano, Ei-ichi Sato, and Kei-ichi Watanabe,
Journal of Algebra, Special Issue in Honor of Paul Roberts, 322 (2009), 3248-3267.
- An algorithm for computing the integral closure, with Irena Swanson,
Algebra & Number Theory 3 (2009), 587-595.
- Bockstein homomorphisms in local cohomology, with Uli Walther,
Journal für die reine und angewandte Mathematik 655 (2011), 147-164.
- Reconciling Riemann-Roch results, with Paul Roberts,
Contemporary Mathematics 555 (2011), 165-172.
- Galois extensions, plus closure, and maps on local cohomology, with Akiyoshi Sannai,
Advances in Mathematics 229 (2012), 1847-1861.
- A note on Bockstein homomorphisms in local cohomology, with Uli Walther,
Advanced Studies in Pure Mathematics 62 (2012), 513-521.
- Rings of Frobenius operators, with Mordechai Katzman, Karl Schwede, and Wenliang Zhang,
Mathematical Proceedings of the Cambridge Philosophical Society 157 (2014), 151-167.
- Local cohomology modules of a smooth Z-algebra have finitely many associated primes, with Bhargav Bhatt, Manuel Blickle,
Gennady Lyubeznik, and Wenliang Zhang, Inventiones Mathematicae, 197 (2014) 509-519.
- Appendix, with Karl Schwede, to Deformation of F-injectivity and local cohomology, by Jun Horiuchi, Lance E. Miller,
and Kazuma Shimomoto, Indiana University Mathematics Journal 63 (2014), 1139-1157.
- The F-pure threshold of a determinantal ideal, with Lance E. Miller and Matteo Varbaro,
Bulletin of the Brazilian Mathematical Society 45 (2014), 767-775.
- The F-pure threshold of a Calabi-Yau hypersurface, with Bhargav Bhatt,
Mathematische Annalen 362 (2015), 551-567.
- Local cohomology supported at determinantal ideals, with Gennady Lyubeznik and Uli Walther,
Journal of the European Mathematical Society 18 (2016), 2545-2578.
- A Gorenstein criterion for strongly F-regular and log terminal singularities, with Matteo Varbaro and Shunsuke Takagi,
International Mathematics Research Notices 21 (2017), 6484-6522.
- Positive characteristic methods in commutative algebra,
GIAN lecture notes, 2017.
- A polynomial identity via differential operators, in: Homological and computational methods in commutative algebra
(Cortona, 2016), Springer INdAM Series 20 (2017), 239-247.
- Hankel determinantal rings have rational singularities,
with Aldo Conca, Maral Mostafazadehfard, and Matteo Varbaro, Advances in Mathematics 335 (2018), 111-129.
- Stabilization of the cohomology of thickenings, with Bhargav Bhatt, Manuel Blickle, Gennady Lyubeznik, and Wenliang Zhang,
American Journal of Mathematics 141 (2019), 531-561.
- On a conjecture of Lynch, with Uli Walther,
Communications in Algebra 48 (2020), 2681-2682.
- Homogeneous prime elements in normal two-dimensional graded rings,, with Ryo Takahashi and Kei-ichi Watanabe,
Journal of Algebra, Special Issue in Honor of Craig Huneke, 571 (2021), 339-349.
- Koszul and local cohomology, and a question of Dutta, with Linquan Ma and Uli Walther,
Mathematische Zeitschrift 298 (2021), 697-711.
- An asymptotic vanishing theorem for the cohomology of thickenings, with Bhargav Bhatt, Manuel Blickle, Gennady Lyubeznik,
and Wenliang Zhang, Mathematische Annalen 380 (2021), 161-173.
- Differential operators on classical invariant rings do not lift modulo p, with Jack Jeffries,
Advances in Mathematics 432 (2023), paper no. 109276, 53 pp.
- When are the natural embeddings of classical invariant rings pure? with Mel Hochster, Jack Jeffries, and Vaibhav Pandey,
Forum of Mathematics, Sigma 11 (2023), paper no. e67, 43 pp.
- On Segre products, F-regularity, and finite Frobenius representation type, with Kei-ichi Watanabe,
Acta Mathematica Vietnamica, Special Issue in Honor of Ngo Viet Trung, 49 (2024), 129-138.
- On an example of Nagarajan, with Annie Giokas,
Journal of Algebra 638 (2024), 931-936.
- Local cohomology of modular invariant rings, with Kriti Goel and Jack Jeffries,
Transformation groups, to appear.
- Frobenius on the cohomology of thickenings, with Bhargav Bhatt, Manuel Blickle, Gennady Lyubeznik, and Wenliang Zhang,
International Mathematics Research Notices 10 (2024), 8557-8567.
- Flat morphisms with regular fibers do not preserve F-rationality, with Eamon Quinlan-Gallego and Austyn Simpson,
Revista Matemática Iberoamericana 40 (2024), 1989–2001.
- Invariant rings of the special orthogonal group have nonunimodal h-vectors,
with Aldo Conca and Matteo Varbaro, Journal of Algebra and its Applications, Special Issue in Honor of Sudhir Ghorpade, to appear.
- Applications of perverse sheaves in commutative algebra, with Bhargav Bhatt, Manuel Blickle, Gennady Lyubeznik, and Wenliang Zhang,
Preprint.
- Frobenius representation type for invariant rings of finite groups, with Mitsuyasu Hashimoto,
Advances in Mathematics, to appear.
- Ideals generated by power sums, with Aldo Conca and Kannan Soundararajan,
Revue Roumaine de Mathématiques Pures et Appliquées, Special Issue in Honor of Lucian Bădescu, to appear.
- Commutative algebra and interactions with algebraic geometry and combinatorics, June 2004,
International Centre for Theoretical Physics (ICTP), Trieste, Italy. (Four lectures)
- Summer school in commutative algebra: Local cohomology and its interactions with algebra, geometry, and analysis,
June 2005, Snowbird, Utah. (Three lectures)
- Fourth Japan-Vietnam Joint Seminar on Commutative Algebra, February 2009, Meiji University, Tokyo, Japan. (Five lectures)
- CIMPA-TUBITAK school on commutative algebra and applications to combinatorics and algebraic geometry,
September 2010, Feza Gürsey Institute, Istanbul, Turkey. (Five lectures.)
- Workshop on local cohomology, July 2011, Indian Institute of Technology, Bombay, India. (Five lectures)
- Pragmatic: Research school in algebraic geometry and commutative algebra, June-July 2014, Catania, Italy. (Five lectures)
- D-modules in commutative algebra, August 2015, Guanajuato, Mexico. (Three lectures)
- Advanced Instructional School on invariant theory, December 2015-January 2016,
Chennai Mathematical Institute, India. (Five 90-minute lectures)
- Mini-course on invariants of finite groups, August 2016, Universidad de Costa Rica, San José, Costa Rica. (Six 3-hour lectures)
- GIAN lecture series on positive characteristic methods in commutative algebra, June 2017,
Indian Institute of Technology, Bombay, India. (Ten 90-minute lectures)
- Advanced Instructional School on Gröbner bases and their applications, December 2017,
Indraprastha Institute of Information Technology, Delhi, India. (Two 90-minute lectures)
- Advanced Instructional School on commutative algebra and algebraic geometry in positive characteristics, December 2018,
Indian Institute of Technology, Bombay, India. (Six 75-minute lectures)
- Commutative algebra and its interaction with algebraic geometry, May-June 2023,
MSRI/SLMath Summer Graduate School, University of Notre Dame. (Five lectures)
- Advanced Instructional School on recent trends in commutative algebra, June 2024,
Indian Institute of Technology, Bombay, India. (Three lectures)
- American Mathematical Society Mathfest, August 1996, Seattle, Washington.
- American Mathematical Society Meeting, November 1996, Columbia, Missouri.
- American Mathematical Society Meeting, January 1998, Baltimore, Maryland.
- Second Annual Missouri Algebra Weekend, October 1998, Columbia, Missouri.
- American Mathematical Society Meeting, March 1999, Urbana, Illinois.
- American Mathematical Society Meeting, September 1999, Salt Lake City, Utah.
- Conference on local cohomology, November-December 1999,
Centro de Investigación en Matemáticas (CIMAT), Guanajuato, Mexico.
- American Mathematical Society Meeting, April 2000, Notre Dame, Indiana.
- Commutative algebra seminar, August 2000, University of Minnesota.
- American Mathematical Society Meeting, March 2001, Lawrence, Kansas.
- Colloquium, January 2002, Georgia Institute of Technology.
- Colloquium, January 2002, University of Illinois at Urbana-Champaign.
- Colloquium, February 2002, University of Kentucky.
- Colloquium, February 2002, Syracuse University.
- Special lecture, February 2002, University of Minnesota.
- Workshop on commutative algebra: local and birational theory,
Mathematical Sciences Research Institute (MSRI), December 2002, Berkeley, California.
- Algebra seminar, April 2003, University of Kansas.
- Ellis B. Stouffer Colloquium, April 2003, University of Kansas.
- American Mathematical Society Meeting, May 2003, San Francisco, California.
- Algèbre commutative et ses interactions avec la géométrie algébrique,
Centre International de Rencontres Mathématiques (CIRM), June 2003, Luminy, France.
- Singularities seminar, July 2003, Nihon University, Japan.
- Algebra seminar, July 2003, Shinshu University, Japan.
- Commutative algebra seminar, August 2003, Meiji University, Japan.
- 48th Algebra Symposium, August 2003, Nagoya University, Japan.
- Joint International Meeting of the American Mathematical Society and
the Indian Mathematical Society, December 2003, Bangalore, India.
- Algebra seminar, February 2004, University of Texas at Austin.
- Commutative algebra: homological and birational theory,
Banff International Research Station (BIRS), September 2004, Banff, Canada.
- Algebra seminar, October 2004, University of Georgia.
- American Mathematical Society Meeting, October 2004, Nashville, Tennessee.
- Colloquium, January 2005, University of Notre Dame.
- Colloquium, January 2005, University of Utah.
- Colloquium, February 2005, University of Kansas.
- Colloquium, February 2005, Purdue University.
- Conference on commutative algebra: recent developments in tight closure, April 2005,
University of Arkansas.
- Workshop on Kommutative Algebra, April 2005, Oberwolfach, Germany.
- CIMPA international conference on commutative algebra, January 2006, Hanoi, Vietnam.
- American Mathematical Society Meeting, April 2006, Notre Dame, Indiana.
- American Mathematical Society Meeting, April 2006, San Francisco, California.
- Homological conjectures in commutative algebra: a conference in honor of Paul Roberts,
May 2006, Snowbird, Utah.
- Algebra seminar, February 2007, University of Nebraska.
- Colloquium, February 2007, University of Nebraska.
- Hilbert functions and syzygies in commutative algebra and combinatorics:
a conference in honor of Jürgen Herzog, September 2007, Cortona, Italy.
- Georgia State University-University of South Carolina joint seminar, November 2007, Columbia.
- Macaulay2 conference, March 2008, Cornell University.
- Algèbre commutative et ses interactions avec la géométrie algébrique,
Centre International de Rencontres Mathématiques (CIRM), October 2008, Luminy, France.
- Workshop on Kommutative Algebra, April 2009, Oberwolfach, Germany.
- First Pacific Rim Mathematical Association (PRIMA) Congress, July 2009, Sydney, Australia.
- Commutative algebra and its connections to geometry,
PASI conference honoring Wolmer Vasconcelos, August 2009, Olinda, Brazil.
- Frobenius splittings in algebraic geometry, commutative algebra, and representation theory,
May 2010, University of Michigan.
- Local rings and local study of algebraic varieties,
International Centre for Theoretical Physics (ICTP), June 2010, Trieste, Italy.
- Workshop on integral closure, July 2010, Mathematical Sciences Research Institute (MSRI), Berkeley.
- Georgia State University-University of South Carolina joint seminar, September 2010, Atlanta.
- Algèbre commutative et ses interactions avec la géométrie algébrique,
Centre International de Rencontres Mathématiques (CIRM), November 2010, Luminy, France.
- Colloquium, May 2011, University of California, Riverside.
- Midwest commutative algebra and geometry conference, May 2011, Purdue University.
- Seminar, July 2011, Chennai Mathematics Institute, Chennai, India.
- Relating test ideals and multiplier ideals, August 2011, American Institute of Mathematics (AIM), Palo Alto.
- American Mathematical Society Meeting, October 2011, Lincoln, Nebraska.
- Algebra and number theory seminar, February 2012, Penn State University.
- Colloquium, February 2012, Penn State University.
- Computational workshop on Frobenius singularities and invariants, May 2012, University of Michigan.
- 12th ALGA Meeting, Instituto Nacional de Matemática Pura e Aplicada (IMPA),
August 2012, Rio de Janeiro, Brasil.
- Commutative algebra and algebraic geometry seminar, October 2012, University of California, Berkeley.
- Singularity categories in algebraic geometry and commutative algebra, January 2013,
Indian Institute of Technology, Madras, India.
- Joint International Meeting of the American Mathematical Society and the
Romanian Mathematical Society, June 2013, Alba Iulia, Romania.
- Combinatorial structures in algebra and topology, July 2013, Osnabrück, German.
- Algèbre commutative et ses interactions avec la géométrie algébrique,
Centre International de Rencontres Mathématiques (CIRM), July 2013, Luminy, France.
- International conference on commutative algebra and its interaction to algebraic geometry and combinatorics,
December 2013, Hanoi, Vietnam.
- Colloquium, March 2014, University of Arkansas.
- American Mathematical Society Meeting, April 2014, Albuquerque, New Mexico.
- Seminari geometria algebraica, June 2014, Universitat de Barcelona, Spain.
- Commutative algebra and singularity theory, a conference in honor of Kei-ichi Watanabe,
July-August 2014, Tateyama, Japan.
- Commutative algebra seminar, August 2014, Meiji University, Japan.
- MOCCA: Meeting on combinatorial commutative algebra, September 2014, Trento, Italy.
- American Mathematical Society Meeting, October 2014, San Francisco, California.
- Recent developments in positive characteristic techniques in commutative algebra:
Frobenius operators and Cartier algebras, March 2015, Georgia State University.
- Joint International Meeting of the American Mathematical Society, European Mathematical Society, and
Sociedade Portuguesa de Matemática, June 2015, Porto, Portugal.
- Midwest commutative algebra conference, August 2015, Purdue University.
- Syzygies in algebra and geometry, August 2015, Haeundae, South Korea.
- KUMUNU conference, October 2015, University of Missouri.
- Commutative algebra and algebraic geometry seminar, January 2016, Indian Institute of Technology, Bombay, India.
- American Mathematical Society Meeting, March 2016, Athens, Georgia.
- Homological and computational methods in commutative algebra,
a conference in honor of Winfried Bruns, May-June 2016, Cortona, Italy.
- Commutative algebra and its interactions with algebraic geometry: tight closure, linkage, and syzygies,
a conference in honor of Craig Huneke, July 2016, University of Michigan.
- Algebra and geometry seminar, December 2016, Università di Genova, Italy.
- Colloquium, February 2017, Reed College.
- Commutative algebra seminar, April 2017, University of Michigan.
- Colloquium, June 2017, International Centre for Theoretical Sciences (ICTS), Bengaluru, India.
- Local cohomology in commutative algebra and algebraic geometry,
a conference in honor of Gennady Lyubeznik, August 2017, University of Minnesota.
- Colloquium, October 2017, University of Notre Dame.
- Algebraic geometry and commutative algebra seminar, October 2017, University of Notre Dame.
- 39th Japan Symposium on Commutative Algebra, November 2017,
Research Institute for Mathematical Sciences (RIMS), Kyoto, Japan.
- Algebraic geometry and number theory conference, December 2017, Indian Statistical Institute, Bengaluru, India.
- Colloquium, October 2018, Georgia State University.
- Algebra seminar, October 2018, Georgia State University.
- Singularities and homological aspects of commutative algebra, February 2019, Oberwolfach, Germany.
- American Mathematical Society Meeting, March 2019, Auburn, Alabama.
- Colloquium, April 2019, Purdue University.
- Conference on commutative algebra and its interaction with algebraic geometry,
in honor of Bernd Ulrich, June 2019, University of Notre Dame.
- Commutative algebra seminar, September 2019, University of Illinois at Chicago.
- Colloquium, October 2019, University of Minnesota.
- Commutative algebra seminar, February 2020, University of Michigan.
- Fellowship of the ring zoom seminar, April 2020, Mathematical Sciences Research Institute (MSRI), Berkeley, California.
- Virtual commutative algebra seminar, June 2020, Indian Institute of Technology, Bombay, India.
- D-modules, group actions, and Frobenius: computing on singularities, August 2021,
Institute for Computational and Experimental Research in Mathematics (ICERM), Brown University.
- Seminar, November 2022, Osaka Metropolitan University, Japan.
- 43rd Japan Symposium on Commutative Algebra, November 2022, Osaka University, Japan.
- Algebraic/arithmetic geometry seminar, December 2022, Technische Universität München, Germany.
- Géométrie écrite: algèbre commutative, January 2023,
Centre International de Rencontres Mathématiques (CIRM), Luminy, France.
- Commutative algebra and algebraic geometry seminar, March 2023, University of California, Berkeley.
- Colloquium, April 2023, Georgia State University.
- Colloquium, April 2024, Simons Laufer Mathematical Sciences Institute, Berkeley.
- International conference on local rings and singularities,
in honor of Jugal Verma, June 2024, Indian Institute of Technology, Bombay, India.
- Seminar, September 2024, Osaka Metropolitan University, Japan.
- Organizer (with P. Roberts), Special session on commutative algebra and algebraic geometry,
Joint Mathematics Meeting, January 2002, San Diego, California.
- Organizer (with F. Enescu and K. E. Smith), Special session on commutative algebra,
American Mathematical Society Meeting, March 2002, Ann Arbor, Michigan.
- Organizer (with S. B. Iyengar, S. Sather-Wagstaff, and C. Yackel), Special session on commutative algebra,
Joint Mathematics Meeting, January 2005, Atlanta, Georgia.
- Organizer (with U. Walther), Local cohomology and its interactions with algebra, geometry, and analysis,
Joint AMS-IMS-SIAM Summer Research Conference, June 2005, Snowbird, Utah.
- Organizer (with S. B. Iyengar, G. Leuschke, and C. Miller), Minnowbrook workshop on commutative algebra,
Minnowrook Adirondack Conference Center, August 2005, Syracuse, New York.
- Organizer (with A. Kustin, M. Miller, and S. Spiroff), Commutative algebra conference honoring the contributions of Phillip Griffith,
University of Illinois, September 2005, Urbana, Illinois.
- Organizer (with P. Roberts and O. Veliche), Special session on commutative algebra,
American Mathematical Society Meeting, October 2006, Salt Lake City, Utah.
- Organizer (with P. Roberts and O. Veliche), Special session on commutative algebra and algebraic geometry,
Joint Mathematics Meeting, January 2007, New Orleans, Louisiana.
- Organizer (with C. Huneke and K. E. Smith), Commutative algebra and its interactions, a conference in honor of Mel Hochster
University of Michigan, August 2008, Ann Arbor, Michigan.
- Organizer (with D. Eisenbud and K.-i. Watanabe), Special session on commutative algebra,
Pacific Rim Mathematical Association (PRIMA) Congress, July 2009, Sydney, Australia.
- Organizer (with P. Roberts and S. Spiroff), Special session on local commutative algebra,
Joint Mathematics Meeting, January 2011, New Orleans, Louisiana.
- Organizer (with S. B. Iyengar and J. Verma), Workshop and conference on local cohomology,
July 2011, Indian Institute of Technology, Bombay, India.
- Organizer (with C.-Y. Chan and L. Miller), Special session on commutative algebra,
American Mathematical Society Meeting, October 2011, Salt Lake City, Utah.
- Organizer (with D. Eisenbud, S. B. Iyengar, E. Miller, and K. E. Smith), Commutative algebra program year,
Mathematical Sciences Research Institute (MSRI), August 2012-May 2013, Berkeley, California.
- Organizer (with B. Bhatt, S. B. Iyengar, and W. Niziol), The homological conjectures, Hot Topics workshop,
Mathematical Sciences Research Institute (MSRI), March 2018, Berkeley.
- Organizer (with S. B. Iyengar), Topics in commutative algebra, May 2018, RTG workshop, University of Utah.
- Organizer (with A. Conca and S. B. Iyengar), Recent developments in commutative algebra,
Centro Internazionale Matematico Estivo (CIME), July 2019, Trento, Italy.
- Organizer (with S. B. Iyengar, C. Miller, and C. Polini), Introductory workshop: Commutative algebra,
January 2024, MSRI/SLMath, Berkeley.
- Organizer (with M. Hashimoto, R. Kanda and S. Takagi), Commutative algebra and singularity theory, in honor of the 80th birthday of Kei-ichi Watanabe,
September 2024, Osaka Metropolitan University, Osaka, Japan.
- Moderator for the arXiv since 2007.
- Editorial Board of Communications in Algebra, 2006-2011.
- Editor (with K. E. Smith) special volume of the Michigan Mathematical Journal in honor of Mel Hochster, Volume 57, 2008.
- Editor (with D. Eisenbud, S. B. Iyengar, J. T. Stafford, and M. Van den Bergh), Commutative Algebra and Noncommutative Algebraic Geometry,
Volume I: Expository Articles, 67, and Volume II: Research Articles, 68, MSRI Publications, Cambridge University Press, 2015.
- Editorial Board of the Journal of the Ramanujan Mathematical Society, since 2023.
- Referee for various journals and conference proceedings.
- Reviewer for Mathematical Reviews. Papers reviewed
