A random collection of conferences and other events.

Conferences and Seminars I attended are marked with ☆, if I gave a talk with ★ (the lists are incomplete).

There are extra sections with the Arbeitstagungen, Oberwolfach conferences, IAS Special Years and the ICM I attended.

- ALGAR 2024: Brauer groups in arithmetic and geometry, Antwerp, 26 - 30 August 2024
- PCMI 2024 Research Topic: Motivic Homotopy (Course Descriptions), IAS/Park City Mathematics Institute, Park City, Utah, July 7-27, 2024

- ALGAR 2023: Local-global principles for quadratic forms, Antwerp, 17 - 25 August, 2023
- Non-archimedean geometry and eigenvarieties, Heidelberg, March 6-17, 2023
- Algebraic groups, their friends and relations (AGFR) (Vavilov's 70th birthday), St. Petersburg, September 19-23, 2022
- ALGAR 2022: Constructive methods for quadratic form theory, Antwerp, 5 - 9 September, 2022
- Arithmetic Aspects of Algebraic Groups, Jun 12 - Jun 17, 2022, BIRS, Banff, Canada
- ALGAR 2021: Systems of quadratic forms over arithmetic fields, Antwerp, 16 - 20 August, 2021
- ALGAR 2020: Valuations, quadratic forms and definability, Antwerp, 6 - 10 July, 2021
- Petersburg Motives, Conference dedicated to 60th anniversary of I.A.Panin, Euler International Mathematical Institute, St. Petersburg, Russia, 2 - 6 September 2019
- ALGAR 2019: Algebras with involution, Antwerp, 1 - 5 July, 2019
- Algebraic K-theory, Oberwolfach, 23 Jun - 29 Jun 2019
- Special Session on Algebraic Groups, Galois Cohomology, and Local-Global Principles, University of Hawaiʻi at Mānoa, Honolulu, HI, March 22-24, 2019

- Vladimir Voevodsky Memorial Conference, IAS, Princeton, September 11 - 14, 2018
- Motives in
St. Petersburg
- Motives and their Applications, St. Petersburg, September 10 - 14, 2018
- Motives and Related Structures (Summer School), St. Petersburg, September 3 - 7, 2018

- Equivariant and Motivic Homotopy, Newton Institute, Cambridge, August 13 - 17, 2018
- ICM 2018 - International Congress of Mathematicians, Rio de Janeiro, August 1 - 9, 2018
- 2018 USC K-theory Summer School; Computations in stable motivic homotopy theory, Los Angeles, July 31 - August 3, 2018
- K-theory School and Workshop, La Plata and Buenos Aires, July 16 - 20 and 23 - 27, 2018
- Classical Algebraic Geometry, Oberwolfach, 15 Jul - 21 Jul 2018
- Workshop on Non-associative Algebras and Applications, Lancaster University, July 9 - 14, 2018
- Homotopy Theory and Arithmetic Geometry: Motivic and Diophantine Aspects, London, July 9 - 13, 2018
- ALGAR 2018: Sums of squares in fields, Antwerp, 2 - 6 July, 2018
- Homotopy
Theory Summer Berlin 2018
- Motivic homotopy groups of spheres III, Berlin, June 25 - 29, 2018
- Equivariant homotopy theory and K-theory, Berlin, June 18 - 22, 2018

- Algebraic Groups and Hermitian K-Theory, Lens, June 18 - June 22, 2018
- Motivic homotopy theory and refined enumerative geometry, Essen, May 14 - 18, 2018
- Quadratic Forms and Related Structures over Fields, Oberwolfach, 29 Apr - 5 May 2018
- 29. NRW Topology Meeting, Bonn, Friday, April 20 and Saturday, April 21, 2018
- K-theory, A1-homotopy and quadratic forms, Warwick, February 12 - 16, 2018

- 28th NRW Topology Meeting, Bielefeld, Friday, November 24 and Saturday, November 25, 2017
- Remembering Vladimir Voevodsky, 1966-2017, IAS, Princeton, October 8, 2017
- Motives: arithmetic, algebraic geometry and topology under the white-blue sky, July 3-7, 2017, LMU Munich
- ALGAR: Quadratic forms and local-global principles, Antwerp, 3 - 7 July, 2017
- Algebraic Cobordism and Projective Homogeneous Varieties, 31 Jan - 6 Feb 2016, Oberwolfach
- Cohomological methods in the theory of algebraic groups (Merkurjev's 60th birthday), CIRM, Luminy, 31/08/2015 au 04/09/2015.
- Linear algebraic groups, vector bundle classification and division rings, June 15-19, 2015, Lens
- (A)round forms, cycles and motives, On the occasion of the 80th birthday of Albrecht Pfister, Mainz, Sept 8-12, 2014
- Quadratic forms, A1-homotopy theory and exceptional groups, June 10-14, 2013, Lens
- Torsors, Nonassociative Algebras and Cohomological Invariants, January-June 2013, Toronto
- Cycles, Motives and Homotopy Theory, on the occasion of Marc Levine's 60th birthday, Essen, June 11 - June 13, 2012
- Galois cohomology, motives and cubic Jordan algebras, May 21-25, 2012, Lens
- Workshop on Exceptional Algebras and Groups, Ottawa, April 19-22, 2012
- Groups 2012 - A conference in honour of the 75th birthday of Bernd Fischer, Bielefeld University, March 12-16, 2012
- Motives: Algebra and Arithmetic, Mainz, Jul 04-08, 2011
- Motives and Milnor Conjecture, Summer School in Jussieu, Paris, June 9 - 17, 2011
- Conference on K-theory and motives, dedicated to Andrei Suslin's 60th birthday, Los Angeles, March 22 - 25, 2011
- ICM 2010 - International Congress of Mathematicians, Hyderabad, India, August 19-27, 2010
- Algebraic Geometry, K-theory, and Motives, dedicated to Andrei Suslin's 60th birthday, St. Petersburg, Russia June 25-29, 2010
- Linear Algebraic Groups and Quadratic Forms, Patching, Involutions and Buildings, Lens, 14th-18th June 2010
- Motives and Homotopy Theory of Schemes, Oberwolfach, 16 May - 22 May 2010
- Workshop on Torsors, Lie algebras and Galois Cohomology, Ottawa, March 26-28, 2010

- A1-Homotopy Theory and its Recent Developments, Program at IAS Princeton during the second term (spring) of the 2009-2010 year.
- Pfister Forms, On the occasion of the 75th birthday of Albrecht Pfister, Mainz, Okt 29-30, 2009
- Rational curves and A^1-homotopy theory, AIM, Palo Alto CA, USA, October 5 to October 9, 2009
- Positivity, Valuations, and Quadratic Forms, Konstanz, 1 - 6 October 2009
- Linear Algebraic Groups and Related Structures, September 13-18, 2009, BIRS, Banff, Canada
- Motivic Homotopy Theory, SFB 478, Münster, July 27 - July 31, 2009
- Algebraic K-Theory and Motivic Cohomology, Oberwolfach, 28 Jun - 4 Jul 2009
- Mini-Cours Torsors and Geometry of Quadrics, Lens, 22-26 June 2009
- Conference on Arithmetic Algebraic Geometry on the occasion of Thomas Zink's 60th birthday, Bielefeld, June 15-19, 2009 · Zink poster
- Quadratic Forms and Linear Algebraic Groups, Oberwolfach, 10 May - 16 May 2009
- Eleventh NRW Topology Meeting, Bielefeld, Friday, May 8 and Saturday, May 9, 2009
- Aspects de la gèomètrie algèbrique: la postèritè mathèmatique de Grothendieck, IHES, 12-16 janvier 2009
- Quadratic forms, linear algebraic groups and cohomology [alternative link], Hyderabad, India, December 30, 2008 to January 4, 2009
- Workshop on Motives--the 4-th, University of Tokyo, Japan, 15-19 December 2008
- QUADRATIC FORMS, ALGEBRAIC GROUPS, ALGEBRAIC COBORDISM AND RELATED TOPICS, University of Nottingham 26th - 30th August 2008
- Mini-Cours Essential dimension and Canonical dimension, Lens, 23-27 June 2008
- Andrew Ranicki 60th birthday, Münster, Wednesday June 18 - Friday June 20, 2008
- Young Topologists' Meeting, 26-31 May 2008 - Le Châtelard - Switzerland
- 9. NRW Topology Meeting, Münster on April 18/19, 2008
- Algebraic cycles II, March 24 - 29, 2008, Columbus, Ohio, USA
- Vorträge von Jean-Pierre Serre, 11. und 13. Februar 2008 im Seminar AG Algebraische Gruppen
- Moduli Spaces, Winter School and Conference, Bonn, 2-6 January, 7-11 January, 2008

- Second International Conference on the Algebraic and Arithmetic Theory of Quadratic Forms, Lake Llanquihue, Chile, December 13 to 19, 2007. (Previous conference)
- Graduate homotopy conference, Tuesday Dec 4 to Friday Dec 7, 2007, Centre for Mathematical Sciences, Cambridge, UK
- Arithmetic Geometry and Rational Varieties, CIRM, Luminy, 3-7 décembre 2007
- 8. NRW Topology Meeting, Bonn (Germany), Friday and Saturday, November 9 and 10, 2007
- Conference on Algebraic Topology - In honour of Prof. Dr. Rainer Vogt on his 65th birthday, Osnabrück (Germany) Friday, October 12th, 2007
- International Algebraic Conference dedicated to the 100th anniversary of D. K. Faddeev, September 24-29, 2007, Saint-Petersburg, Russia
- Summer School: Motives of projective homogeneous varieties, Mainz, September 17-21, 2007
- LMS Workshop on Motives, Quadratic Forms and Algebraic Groups, 27-31 August 2007, Queen's University Belfast, UK
- Central Simple Algebras over Function Fields of Surfaces, Summer School, Universität Konstanz, 26 August - 1 September 2007
- The Abel Symposium 2007, Algebraic Topology, August 5 - 10 2007, Oslo, Norway · my talk (local copy)
- Invariants de Noeuds et Géométrie non commutative, Séminaire Méditerranéen d'Algèbre et Topologie, Jeudi 28 et Vendredi 29 juin 2007, Montpellier
- 8. Arbeitstagung der zweiten Serie, Bonn, June 22-28, 2007 · my talk
- Mini-Cours Formes Quadratiques, Lens, 11-15 Juin 2007
- Linear algebraic groups and cohomology, 16-20 May 2007, Emory University, Atlanta, Georgia, USA
- School and Conference on Algebraic K-Theory and its Applications, The International Centre for Theoretical Physics (ICTP), Trieste, Italy, May 14 to June 1, 2007
- The Seventh NRW Topology Meeting, April 27-28, 2007, Osnabrück.
- Workshop on Homotopy theory of schemes, March 26-30, 2007, Geometric Applications of Homotopy Theory, Fields Institute, Toronto
- From Quadratic Forms to Algebraic Groups, Centro Stefano Franscini, Monte Verità (Ascona), Switzerland, February 18-23, 2007

- Sixth NRW Topology Meeting, November 24-25, 2006, Düsseldorf
- 50th Annual Meeting of the Australian Mathematical Society, Macquarie University, 25 - 29 September 2006
- Hermann Weyl Conference, 10-13. September 2006, Bielefeld · Weyl posters · my talk · MR 2529001, Zbl 1148.43001.
- Algebraic groups, quadratic forms and related topics, September 2 - September 7, 2006, BIRS, Banff, Canada
- ICM 2006 - International Congress of Mathematicians, Madrid, Spain, August 22-30, 2006
- Algebraic K-Theory, Oberwolfach, 16 Jul - 22 Jul 2006
- Quadratic Forms and Linear Algebraic Groups, Oberwolfach, 25 Jun - 1 Jul 2006
- Hodge Theory, June 19-24, 2006, Island of San Servolo, Venice, Italy
- Mini-Cours Formes Quadratiques, Lens, 19-23 Juin 2006
- Rings of Low Rank, 12-16 Jun 2006, Lorentz Center, Leiden, The Netherlands
- Colloque pour le centenaire d'André Weil, 5 et 6 mai 2006, IHES
- Fifth NRW Topology Meeting, April 28-29, 2006, Bielefeld
- Great Lakes K-theory Conference XI, University of Illinois at Chicago, April 22-23, 2006
- K-Theory and related topics, March 13-16, 2006, Beijing
- Mathematisches Kolloquium, 2. Februar 2006, Heidelberg

- Workshop on Quadratic Forms, Linear Algebraic Groups, And Related Topics, 9 - 16 September 2005, University of Nottingham, UK -- RTN Network "K-Theory, Linear Algebraic Groups and Related Structures".
- From Quadratic Forms to Linear Algebraic Groups , Workshop, 25 - 29 July 2005, EPFL, Lausanne
- Conference on Algebraic Topology, June 27 - July 1, 2005 Kraków (Cracow, Poland)
- Special sessions on Homotopy Theory and on Algebraic Cycles at the Joint meeting of AMS, DMV, ÖMG at Mainz, Mainz, June 16-19, 2005
- Arbeitsgemeinschaft mit aktuellem Thema: Algebraic Cobordism, Oberwolfach, 3 Apr - 9 Apr 2005
- The Lichtenbaum Conjectures: Progress and Prospects, in Honor of the 65th birthday of Stephen Lichtenbaum, Brown University, March 18-20, 2005
- Algebraic K-theory, 2004, Montreal, October 2-6, 2004.
- Algebraic Cycles, K-Theory, and Modular Representation Theory, in Honor of the 60th birthday of Eric Friedlander, Northwestern University, September 16-19, 2004
- Department Colloquium, Department of Mathematics, Princeton University, February 23, 2005 · my talk
- Bloch-Kato Conjecture, Special Year at IAS Princeton, 2004-2005 · Seminar on Norm Varieties (my home page at IAS 2004-2005)
- Arithmetic Algebraic Geometry, Oberwolfach, 1 Aug - 7 Aug 2004
- K-Theory, Algebraic Groups and Related Structures, Workshop, Dublin, July 5 to 8, 2004
- Motives, K-theory and Arithmetical Geometry, Genova, June 28 - July 2, 2004
- K-theory and Noncommutative Geometry, Institut Henri Poincare (Paris), March-July, 2004
- Mini-Cours Formes Quadratiques, Lens, 21-25 Juin 2004
- Mathematisches Kolloquium, Bonn, May 28, 2004
- Great Lakes K-theory Conference X, Urbana-Champaign, May 8 - 9, 2004
- NRW Topology Meeting, Bonn, April 23 - 24, 2004
- Motives and Homotopy Theory of Schemes, Oberwolfach, 14 Mar - 20 Mar 2004
- Algebraische Gruppen, Oberwolfach, 29 Feb - 6 Mar 2004

- International Conference on Algebra and Number Theory, University of Hyderabad, 11-16 of December, 2003
- Quadratic forms, algebraic groups, and Galois cohomology, BIRS, Banff, Canada, October 04-09, 2003 -- Photos
- Fields Institute Program on Homotopy Theory and its Applications, University of Western Ontario, London, Ontario, September 2003
- Great Lakes K-theory Conference IX, Fields Institute, Toronto, Ontario, Canada, May 2-3, 2003
- The UM/OSU Weekend Algebraic Geometry Seminar, Columbus, OH, February 8-9, 2003 · my talk
- Zassenhaus
Lectures 2003, Columbus, Ohio, February 6-7, William Fulton,
*Eigenvalues and Schubert Calculus* - International Conference on The Algebraic and Arithmetic Theory of Quadratic Forms, Talca, Chile, December 11-18, 2002
- ICM 2002 - International Congress of Mathematicians, Beijing, China, August 20-28, 2002 · my talk
- Algebraische K-Theorie, Oberwolfach, 4 Aug - 10 Aug 2002
- Quadratic Forms and Algebraic Groups, Oberwolfach, 12 May - 18 May 2002
- Great Lakes K-theory Conference VIII, Urbana-Champaign, April 27, 2002
- Geometry and Topology in Dimensions 3 and 4 - Columbus, Ohio, March 28-31, 2002.
- 52nd Algebra Day, Ottawa, Sept. 29, 2001
- The 969th AMS Meeting (Central Section), Columbus, Ohio, Sept. 21-23, 2001
- K-Theory and Linear Algebraic Groups, Duisburg, September 9-15, 2001
- New developments in K-theory. A special K-theory Day will be held on Friday 22 and Saturday 23 of June in Oxford to celebrate Dan Quillen's 60th birthday.
- Géométrie Algébrique et Applications Arithmétiques. Conférence en l'honneur de Michel Raynaud, Orsay, 18-22 juin 2001
- Great Lakes K-theory Conference VII, Evanston, April 21-22, 2001
- Festkolloquium zum 60. Geburtstag von Guido Mislin, ETH Zürich, 20. April 2001
- Zassenhaus
Lectures 2001 (local copy),
Columbus, Ohio, April 17-19, Vladimir Voevodsky,
*Motivic Homotopy Theory*· Motivic VV poster - Quadratic forms and related topics, Baton Rouge, March 26-30, 2001
- Gill
Distinguished Lecture Series, UCLA, January 2001, Jean-Pierre
Serre,
*Invariants in Galois Cohomology: Definition and Computation*

- Algebraic Cycles, Columbus, Ohio, December 1-3, 2000
- Arithmetic Algebraic Geometry, Oberwolfach, 30 Jul - 5 Aug 2000 · my talk
- ECM3 - 3rd European Congress of Mathematics, Barcelona, July 10-14, 2000
- Conference on Algebraic K-Theory and Homotopy Theory of Schemes, Toulouse, July 3-7, 2000
*Ojanguren 60*, a conference to celebrate Manuel Ojanguren's 60th birthday, University of Lausanne, May 24, 2000- Topology seminar, CUNYMath at The City University of New York, April 12, 2000 · abstract
- Great Lakes K-theory Conference VI, Toronto, March 25-26, 2000
- Geometry/Topology Seminar, Duke University, March 21, 2000 · abstract
- International Colloquium on Algebra, TIFR, Mumbai, January 4-12, 2000

- Motivic Homotopy Theory Program, Special Year at IAS Princeton, 1999-2000 · Lectures on Norm Varieties (my home page at IAS 1999-2000)
- Algebraische K-Theorie, Oberwolfach, 26 Sep - 2 Oct 1999
- Augsburger Geometrietage, Augsburg, July 6-15, 1999
- Quadratic forms and their applications, Dublin, July 5-9, 1999
- Arbeitstagung, Bonn, June 18-24, 1999
- Workshop on Homotopy theory and K-theory of schemes, Münster, 31.5.-3.6.1999
- Workshop on Quadratic forms and related topics, Besancon, May 25-28, 1999
- Quadratische und Hermitische Formen, Oberwolfach, 6 May - 22 May 1999
- Program on K-Theory,
American Institute of
Mathematics (AIM), Palo Alto, CA, April-May 1999
- West Coast Topology Conference, Stanford, April 24-25, 1999

- Great Lakes K-theory Conference V, March 20-21, 1999
- Kolloquium Münster, 21.1.1999
- Mathematische Gesellschaft Göttingen, Jan 14, 1999

- Workshop on Norm Varieties and Algebraic Groups, Zürich, December 14-16, 1998
- ICM 98 - International
Congress of Mathematicians, Berlin, August 18-27, 1998
- ICM Satellite Conference: Linear Algebraic Groups and Related Structures, Bielefeld, Germany, August 9-15, 1998
- ICM Satellite Conference: Algebraic and Arithmetic Geometry, Essen, Germany, August 10-15, 1998

- Workshop on Homotopy theory for algebraic varieties with applications to K-theory and quadratic forms, MSRI, Berkeley, May 11-16, 1998
- Algebraische Gruppen, Oberwolfach, 5 Apr - 11 Apr 1998 · my talk
- Arbeitsgemeinschaft mit aktuellem Thema: The Milnor Conjecture, Oberwolfach, 29 Mar - 4 Apr 1998
- Théorie homotopique des schémas, d'aprés Voevodski et al., Nice, 13-14 mars, 1998
- Great Lakes K-theory Conference IV, Notre Dame, March 7-8, 1998
- von Staudt-Preis an Martin Kneser, Erlangen, 9. Dezember 1997
- International
Algebraic Conference dedicated to the memory of D. K. Faddeev,
St. Petersburg, Russia, 24-30 June, 1997
- Andrei Suslin's Seminar, St. Petersburg, June 26?, 1997

- Algebraische K-Theorie, Oberwolfach, 9 Jun - 15 Jun 1996 · my talk
- AMS-Benelux, Antwerp, May 22-25, 1996

Without Arbeitstagungen and Oberwolfach conferences.

- Linear Algebraic Groups and Related Structures, Bielefeld, July 2-8, 1995
- Algebraic K-theory, Paris, July 26-30, 1994
- Quadratic Forms, Luminy, June 6-10, 1994
- Kervaire Seminar, Geneva, February 1992
- Formes quadratiques en algèbre, géometrie et théorie des nombres, Centro Stefano Franscini, Monte Verità (Ascona), Switzerland, November 4-9, 1991
- Conference at a castle in Belgium. ?
- Andrei Suslin's Seminar, Leningrad, Nov. 1988
- Colloquia, Helsinki and Joensuu, Nov. 1988
- Colloquia/Seminars, UC Berkeley, Harvard, Chicago, Los Angeles, San Diego, Oct. 1987
- Colloquia/Seminars, Gent, Utrecht, Nijmegen, 1987
- Seminar, Göttingen, 1987
- Fakultätskolloquium Bielefeld, 12. Juni 1987
- Seminar, Paris VII (Jussieu), Paris, 1987

- ICM 2002 - International Congress of Mathematicians, Beijing, China, August 20-28, 2002 · my talk

- Bloch-Kato
Conjecture, IAS Princeton, 2004-2005
- Seminar on Norm Varieties (my home page at IAS 2004-2005)
- Norm Varieties Seminar (8 talks by Suslin, Oct 20 - Dec 08 2004)
- Norm Varieties Seminar (12 talks by Rost, Jan 19 - Mar 23 2005)
- Department Colloquium, Department of Mathematics, Princeton University, February 23, 2005 · my talk
- Special Year 2004-05: The Bloch-Kato Conjecture - Seminar (14 talks by Voevodsky) [continued 2006-07]

- Motivic
Homotopy Theory Program, IAS Princeton, 1999-2000
- Lectures on Norm Varieties (my home page at IAS 1999-2000)
- Lectures on Norm Varietes (22-27 talks by Rost, Oct 6 1999 - May 24 2000)
- Motivic Cohomology Lectures (25 talks by Voevodsky)

- 8. Arbeitstagung der zweiten Serie, Bonn, June 22-28, 2007 · my talk
- 1. Mathematische Arbeitstagung (Neue Serie), Bonn, June 9-15, 1993
- 30. Mathematische Arbeitstagung, Bonn, June 14-20, 1991
- 26. Mathematische Arbeitstagung, Bonn, June 13-20, 1986
- 25. Mathematische Arbeitstagung, Bonn, June 15-22, 1984

- Arithmetic Algebraic Geometry, Oberwolfach, 30 Jul - 5 Aug 2000 · my talk
- Algebraische Gruppen, Oberwolfach, 5 Apr - 11 Apr 1998 · my talk
- Algebraische K-Theorie, Oberwolfach, 9 Jun - 15 Jun 1996 · my talk
- Quadratische Formen, Oberwolfach, 18 Jun - 24 Jun 1995 · my talk I · my talk II
- Arbeitsgemeinschaft mit aktuellem Thema: Beschränktheit der Ordnung von Torsionspunkten elliptischer Kurven über Zahlkörpern, Oberwolfach, 9 Oct - 15 Oct 1994
- Algebraische K-Theorie, Oberwolfach, 27 Jun - 3 Jul 1993 · my talk
- Quadratische Formen, Oberwolfach, 17 May - 23 May 1992 · my talk I · my talk II
- Arbeitsgemeinschaft "Connections between Mathematical Physics and Knot Theory", Oberwolfach, 31 Mar - 6 Apr 1991
- Quadratische Formen, Oberwolfach, 2 Jul - 8 Jul 1989 · my talk
- Arbeitsgemeinschaft Geyer-Harder: Brownsche Bewegung auf Riemannschen Mannigfaltigkeiten, Oberwolfach, 2 Oct - 8 Oct 1988
- Algebraische K-Theorie, Oberwolfach, 5 Jun - 11 Jun 1988 · my talk
- Zyklische Kohomologie und ihre Anwendungen, Oberwolfach, 14 Jun - 20 Jun 1987
- Arbeitsgemeinschaft Geyer-Harder über Yang-Mills-Theorie, Oberwolfach, 5 Oct - 11 Oct 1986
- Arbeitsgemeinschaft: Die Beilinson-Vermutung, Oberwolfach, 6 Apr - 12 Apr 1986
- Arbeitsgemeinschaft: K-Theorie von Körpern, Oberwolfach, 6 Oct - 12 Oct 1985
- Arbeitsgemeinschaft: Chaos in dynamischen Systemen, Oberwolfach, 9 Apr - 12 Apr 1985 · my talk
- Arbeitsgemeinschaft Geyer-Harder über 4-Mannigfaltigkeiten, Oberwolfach, 7 Oct - 13 Oct 1984 · my talk