# Bücher, Vorlesungen, Vorträge und Abschlussarbeiten

**2021**

Nikolay Kozyrev, Sergey Krivonos and Olaf Lechtenfeld:*New approach to N=2 supersymmetric Ruijsenaars-Schneider model*

arXiv:2103.02925 [hep-th]

(Talk by N.K. at RDP online workshop "Recent Advances in Mathematical Physics" - Regio2020,

Yerevan, Armenia, 06 December 2020;

Proceedings: PoS Regio2020 (2020) 018)

Olaf Lechtenfeld:*Electromagnetic knots from de Sitter space*

arXiv:2102.13534 [hep-th]

(Talk at RDP online workshop "Recent Advances in Mathematical Physics" - Regio2020,

Yerevan, Armenia, 06 December 2020;

Proceedings: PoS Regio2020 (2020) 011)

**2020**

Evgeny Ivanov, Olaf Lechtenfeld and Sergey Fedoruk:*Supersymmetric Calogero models from superfield gauging*arXiv:2001.04873 [hep-th]

(Talk by E.I. at the International Bogolyubov Conference "Problems of Theoretical and Mathematical Physics", Moscow-Dubna, Russia, 9-13 September, 2019;

Proceedings: )

**2019**

Olaf Lechtenfeld:*From Yang-Mills in de Sitter space to electromagnetic knots*(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Yerevan, Armenia, 26 - 31 August, 2019;

Proceedings: Physics of Particles and Nuclei Letters

**17**(2020) 701-706)

**2018**

Olaf Lechtenfeld and Gleb Zhilin:*A new construction of rational electromagnetic knots*

(Talk by O.L. at "Workshop on Duality and Generalized Geometries'', Corfu, Greece, 09-16 September 2018;

Proceedings: PoS CORFU2018 (2018) 149)

Olaf Lechtenfeld and Gleb Zhilin:*Rational Maxwell knots via de Sitter space*

(Talk by O.L. at the "32nd International Colloquium on Group Theoretical Methods in Physics (Group32)'', Prague, Czech Republic, 09-13 July 2018;

Proceedings: J. Phys.: Conf. Series **1194** (2019) 012068)

Sergey Krivonos, Olaf Lechtenfeld and Anton Sutulin:*Extended supersymmetric multiparticle Euler-Calogero-Moser model*

(Talk by A.S. at the "32nd International Colloquium on Group Theoretical Methods in Physics (Group32)'', Prague, Czech Republic, 09-13 July 2018;

Proceedings: J. Phys.: Conf. Series **1194** (2019) 012062)

**2017**

Tatiana A. Ivanova, Olaf Lechtenfeld and Alexander D. Popov:*Pure Yang-Mills solutions on dS _{4}*

(Talk by O.L. at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 31 July - 05 August, 2017;

Proceedings: Physics of Particles and Nuclei Letters (2018);

and at "Workshop on Testing Fundamental Physics Principles'', Corfu, Greece, 22-28 September 2017;

Proceedings: PoS CORFU2017 (2017) 204)

Nikolay Kozyrev, Sergey Krivonos, Olaf Lechtenfeld, Armen Nersessian and Anton Sutulin:*Curved WDVV equation and supersymmetric mechanics*

(Talk by S.K. at the XVII International Conference "Integrable Systems and Quantum Symmetries'', Prague, Czech Republic, 06-10 June 2017;

Proceedings: J. Phys.: Conf. Series **965** (2018) 012026)

**2016**

Francisco Correa and Olaf Lechtenfeld:

Calogero, spherically reduced and PT-deformed

(Talk by O.L. at the Ringberg Meeting on Geometry and Physics, 20-25 November 2016; contribution to the proceedings of the School and Workshop on Elementary Particle Physics and Gravity, Corfu Summer Institute on Elementary Particles and Gravity, Corfu, Greece, 31 August- 23 September 2016;

Proceedings: PoS Corfu2016 (2016) 095)

Francisco Correa and Olaf Lechtenfeld:

*The tetrahexahedric angular Calogero model*

(Talk by O.L. at ISQS-24, Prague, 14-18 June 2016;

Proceedings: J. Phys.: Conf. Series **804** (2017) 012011)

Francisco Correa and Olaf Lechtenfeld:

*The tetrahexahedric Calogero model*

arXiv:1604.06457 [hep-th]

(Talk by O.L. at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 03-08 August, 2015;

Proceedings: Physics of Particles and Nuclei Letters (2016) )

**2015**

Olaf Lechtenfeld:

*On asteroid engineering*

arXiv:1511.07491 [physics.class-ph] (GJSFR Volume 16 Issue 2 Year 2016, pp. 1-12)

Andreas Deser:

*Star products on graded manifolds and α'-corrections to double field theory*

(Proceedings of XXXIV Workshop on Geometric Methods in Physics, Bialowieza)

**2014**

Konstantinos Anagnostopoulos, Olaf Lechtenfeld, Dieter Lüst, Hikaru Kawai, Jun Nishimura, Harold Steinacker, Richard Szabo, Satoshi Watamura, George Zoupanos (eds.):

*Workshop on Noncommutative Field Theory and Gravity (CORFU2013-NC)*

(Part of 13th Hellenic School and Workshops on Elementary Particle Physics and Gravity;

Proceedings of the Workshop in Corfu, Greece, 08-15 September 2013;

Fortsch. Phys. **62** (2014) issue 9-10, pp. 703-897)

Athanasios Chatzistavrakidis and Fridrik Freyr Gautason:

*U-dual branes and mixed symmetry tensor fields*

arXiv:1404.7635 [hep-th]

(Talk by A.C. at the Workshop on Noncommutative Field Theory and Gravity, Corfu Summer Institute on Elementary Particles and Physics, Corfu, Greece, 08-15 September 2013;

Fortschr. Phys. **62** (2014) 743-748)

Susha L. Parameswaran and Ivonne Zavala:

*Worldsheet instantons and coupling selection rules in heterotic orbifolds*

arXiv:1401.6162 [hep-th]

(Talk by S.L.P. at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 29 July - 03 August 2013;

Proceedings: Physics of Particles and Nuclei (2014) )

**2013**

Olaf Lechtenfeld:

*On the Gribov problem in Yang-Mills theory*

arXiv:1312.6308 [hep-th]

(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 29 July - 03 August 2013;

Proceedings: Physics of Particles and Nuclei Letters **11** (2014) 830-835)

Evgeny Ivanov, Olaf Lechtenfeld and Boris Zupnik:

*New approach to duality-invariant nonlinear electrodynamics*

arXiv:1310.5362 [hep-th]

(Talk by E.I. at ISQS-21, Prague, 11-16 June 2013,

Proceedings: J. Phys.: Conference Series **474** (2013) 012023)

Athanasios Chatzistavrakidis and Larisa Jonke:

*Generalized fluxes in matrix compactifications *

arXiv:1305.1864 [hep-th]

(Talk by A.C. at the School and Workshop on Elementary Particle Physics and Gravity, Corfu Summer Institute on Elementary Particles and Physics, Corfu, Greece, 08-27 September 2012;

Proceedings: PoS Corfu2012 (2013) 095)

**2012**

Sergey Fedoruk, Evgeny Ivanov and Olaf Lechtenfeld:

*Gauged N=4 supersymmetric mechanics with spin supermultiplets*

(Talk by S.F. at the XXIX International Colloquium on Group-Theoretical Methods in Physics, Tianjin, China, 20-26 August, 2012;

Proceedings: World Scientific)

Olaf Lechtenfeld:

*Instantons and Chern-Simons flows in six and seven dimensions*

(Talk at the Conference on Quantum Field Theory and Gravity `QFTG'12', Tomsk, Russia, 31 July - 04 August, 2012;

Proceedings: Tomsk State Pedagogical University Bulletin **128** (2012) 103-108)

Nikolay Kozyrev, Sergey Krivonos and Olaf Lechtenfeld:

*N=2 supersymmetric S ^{2}->CP^{3}->S^{4} fibration viewed as superparticle mechanics*

arXiv:1210.4587 [hep-th]

(Talk by S.K. at ISQS-20, Prague, 17-23 June 2012,

Proceedings: J. Phys.: Conference Series

**411**(2013) 012019)

Magnus Goffeng and Olaf Lechtenfeld:

*Noncommutative deformation of the Ward metric*

arXiv:1205.0020 [hep-th]

(Talk by O.L. at the Workshop on Noncommutative Field Theory and Gravity, Corfu Summer Institute on Elementary Particles and Physics, Corfu, Greece, 04-18 September 2011;

Proceedings: PoS CORFU2011 (2011) 062)

Tigran Hakobyan, Olaf Lechtenfeld, Armen Nersessian, Armen Saghatelian and Vahagn Yeghikyan

*Action-angle variables and novel superintegrable systems*

(Talk by A.N. at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 18-23 July, 2011;

Proceedings: Physics of Particles and Nuclei **43** (2012) 577-582)

Olaf Lechtenfeld:

*Instantons and Chern-Simons flows in 6,7 and 8 dimensions*

arXiv:1201.6390 [hep-th]

(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 18-23 July, 2011;

Proceedings: Physics of Particles and Nuclei **43** (2012) 569-576)

Christoph Nölle:

*Heterotic supergravity on manifolds with Killing spinors*

ITP-UH-01/12

(PhD thesis)

**2011**

** 2010**

André Fischer:

*Matrix-model formulation of LS-covariant noncommutative quantum field theories on Minkowski spacetime*

ITP-UH-20/10

(PhD thesis)

Kirsten Vogeler:

*Conformal ghosts on the sphere*

ITP-UH-19/10

(PhD thesis)

Theodora Ioannidou and Olaf Lechtenfeld:

*Noncommutative baby skyrmions*

(Talk by T.I. at the Workshop on Noncommutative Field Theory and Gravity, Corfu Summer Institute on Elementary Particles and Physics, Corfu, Greece, 08-12 September 2010;

Proceedings: PoS CNCFG2010 (2010) 020)

Olaf Lechtenfeld and Marco Maceda:

*The Kähler potential of the non-commutative CP ^{1} model*

(Talk by M.M. at the IV Mexican Meeting on Experimental and Theoretical Physics: Symposium on Gravitation BEC's Phenomenology, Mexico City, Mexico, July 2010;

AIP Conference Proceedings Vol.

**1318**(2010) 187-195)

Christoph Nölle:*Quantum mechanics and classical trajectories*

arXiv:1005.3786 [math-ph]

(unpublished)

Johannes Brödel:

Alternative approaches to maximally supersymmetric field theories

ITP-UH-13/10

(PhD thesis)

Olaf Lechtenfeld and Marco Maceda:

On the non-commutative CP^{1} model

(Talk by M.M. at the VIII School of the Gravitation and Mathematical Physics, Playa del Carmen, Quintana Roo, Mexico, December 2009;

AIP Conference Proceedings Vol. **1256** (2010) 208-212)

André Fischer and Richard J. Szabo:

*UV/IR duality in noncommutative quantum field theory*

arXiv:1001.3776 [hep-th]

(Talk by R.J.S. at three workshops/schools in 2009, Gen. Relativ. Gravit. **43** (2010) 2509-2522, DOI: 10.1007/s10714-010-1046-9)

Sergey Fedoruk, Evgeny Ivanov and Olaf Lechtenfeld:

*New super Calogero models and OSp(4|2) superconformal mechanics*

arXiv:1001.2536 [hep-th]

(Talk by E.I. at the XIII International Conference "Symmetry Methods in Physics", Dubna, Russia, 06-09 July 2009)

**2009**

Christoph Nölle:

*Geometric and deformation quantization*

arXiv:0903.5336 [math-ph]

(unpublished)

**2008**

Olaf Lechtenfeld:

*N=4 mechanics, WDVV equations and polytopes*

arXiv:0811.0021 [hep-th]

(Talk at the XVII International Colloquium on Integrable Systems and Quantum Symmetries in Prague, Czech Republic, 19-21 June 2008, and at the XXVII International Colloquium on Group Theoretical Methods in Physics in Yerevan, Armenia, 13-19 August 2008)

Olaf Lechtenfeld:

*WDVV solutions from orthocentric polytopes and Veselov systems*

arXiv:0804.3245 [hep-th]

(in: Problems of Modern Theoretical Physics, ed. V. Epp, Tomsk State Pedagogical University Press, 2008, pp. 256-265)

Hendrik Adorf:

*Boundary conformal field theory analysis of the H _{3}^{+} model*

ITP-UH-08/08

(PhD thesis)

**2007**

Olaf Lechtenfeld:

*Noncommutative solitons*

arXiv:0710.2074 [hep-th]

(Talk at the "Third Mexican Meeting on Mathematical and Experimental Physics'' at El Colegio Nacional, Mexico City, Mexico, 14-17 September 2007;

AIP Conference Proceedings Vol. **977** (2008) 37-51)

Olaf Lechtenfeld:

*Supersymmetric noncommutative solitons*

arXiv:0707.3522 [hep-th]

(Talk at "Noncommutative Spacetime Geometries" in Alessandria, Italy, 26-31 March 2007, and "Noncommutative Geometry and Physics" in Orsay, France, 23-27 April 2007;

Journal of Physics: Conference Series **103** (2008) 012016)

Olaf Lechtenfeld, Alexander D. Popov and Richard J. Szabo:

*Quiver gauge theory and noncommutative vortices*

arXiv:0706.0979 [hep-th]

(Talk by O.L. at the 21st Nishinomiya-Yukawa Memorial Symposium in Nishinomiya/Kyoto, Japan, 11-15 November 2006;

Proceedings: Prog. Theor. Phys. Suppl. **171** (2007) 258-268)

Stefan Petersen:

*Abelian solitons in the noncommutative Ward model*

(Talk by S.P. at the 21st Nishinomiya-Yukawa Memorial Symposium in Nishinomiya/Kyoto, Japan, 11-15 November 2006;

Proceedings: Prog. Theor. Phys. Suppl. **171** (2007) 223-227)

**2006**

Stefan Petersen:

*Aspects of solitons in noncommutative field theories -- the modified Ward model*

ITP-UH-27/06

(PhD thesis)

Leonardo Quevedo:

*Non(anti)commutative gauge theories in harmonic superspace*

ITP-UH-19/06

(PhD thesis)

Martin Wolf:

*On supertwistor geometry and integrability in super gauge theory*

hep-th/0611013

(PhD thesis)

Olaf Lechtenfeld:

*Noncommutative solitons*

hep-th/0605034

(150 minutes of lectures given 01-04 November 2005 at the International Sendai-Beijing Joint Workshop on Noncommutative Geometry and Physics;

Proceedings: pp. 175-200, World Scientific, 2007)

**2005**

Christian Sämann:

*Aspects of twistor geometry and supersymmetric field theories within superstring theory*

hep-th/0603098

(PhD thesis)

Alexandra De Castro, Evgeny Ivanov, Olaf Lechtenfeld and Leonardo Quevedo:

*Non-singlet Q-deformations of N=2 gauge theories*

hep-th/0512275

(Talk by A.D.C. at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 27-31 July 2005;

Proceedings: SQS '05, pp. 116-121)

Christian Sämann:

*The mini-superambitwistor space*

hep-th/0511251

(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 27-31 July 2005;

Proceedings: SQS '05, pp. 407-414)

Martin Wolf:

*Twistors and aspects of integrability of self-dual SYM theory*

hep-th/0511230

(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 27-31 July 2005;

Proceedings: SQS '05, pp. 448-455)

Olaf Lechtenfeld:

*Integrable noncommutative sine-Gordon model*

ps file

(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 27-31 July 2005;

Proceedings: SQS '05, pp. 238-244)

**2004**

Michael Flohr and Marco Krohn:

*A note on four-point functions in logarithmic conformal field theories*

hep-th/0501144 (Talk by M.F. at the 37th International Symposium Ahrenshoop on the Theory of Elementary Particles, Berlin-Schmöckwitz, 23-27 August 2004:

Fortsch. Phys. **53** (2005) 456-462)

Olaf Lechtenfeld:

*Noncommutative sine-Gordon model*

hep-th/0409108

(Talk at the XIIIth International Colloquium Integrable Systems and Quantum Groups, Prague, 17-19 June 2004, and at the 37th International Symposium Ahrenshoop on the Theory of Elementary Particles, Berlin-Schmöckwitz, 23-27 August 2004:

Czech. J. Phys. **54** (2004) 1351-1357; Fortsch. Phys. **53** (2005) 500-505)

Michael Flohr:

*Logarithmic conformal field theory - or - how to compute a torus amplitude on the sphere*

hep-th/0407003

(Contribution to the Ian Kogan Memorial Volume from Fields to Strings: Circumnavigating Theoretical Physics)

Evgeny Ivanov, Olaf Lechtenfeld and Boris Zupnik:

*Non-anticommutative N=(1,1) Euclidean superspace*

hep-th/0402062

(Talk by E.I. at the workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 24-29 July 2003;

Proceedings: SQS '03, pp. )

**2003**

Olaf Lechtenfeld:

*Noncommutative instantons and solitons*

hep-th/0401158

(Talk at the 27th Johns Hopkins Workshop on Current Problems in Particle Theory, Göteborg, Sweden, 24-26 August 2003, and at the 36th International Symposium Ahrenshoop on the Theory of Elementary Particles, Berlin-Schmöckwitz, Germany, 26-30 August 2003:

short version: Fortsch. Phys. **52** (2004) 596-605; long version: JHEP PRHEP-jhw2003/017)

Michael Flohr and Marco Krohn:

*Operator product expansion and zero mode structure in logarithmic cft*

hep-th/0312158

(Talk by M.F. at the 36th International Symposium Ahrenshoop on the Theory of Elementary Particles, Berlin-Schmöckwitz, Germany, 26-30 August 2003:

Fortsch. Phys. **52** (2004) 503-508)

Sebastian Uhlmann:

*String field theory: methods and solutions*

ITP-UH-07/03

(PhD Thesis)

**2002**

Alexander Kling, Olaf Lechtenfeld, Alexander D. Popov and Sebastian Uhlmann:

*Solving string field equations: new uses for old tools*

hep-th/0212335

(Talk by O.L. at the 35th International Symposium Ahrenshoop on the Theory of Elementary Particles, Berlin-Schmöckwitz, Germany, 26-30 August 2002:

Fortsch. Phys. **51** (2003) 775-780)

Bernd Spendig:

*Der N=2 String auf nicht trivialen Hintergründen*

ITP-UH-19/02

(PhD Thesis)

**2001**

Michael Flohr and Shahin Rouhani (eds.):

*Logarithmic conformal field theory and its applications*

(Proceedings to the School and Workshop on Logarithmic Conformal Field Theory, Tehran, Iran, 4-18 Sep 2001;

Int. J. Mod. Phys. A **18** (2003) 4497-4796)

Michael Flohr:

*Bits and pieces in logarithmic conformal field theory*

hep-th/0111228

(Lecture notes for the School and Workshop on Logarithmic Conformal Field Theory, Tehran, Iran, 04-18 Sep 2001;

Int. J. Mod. Phys. A **18** (2003) 4497-4593)

Helge Dennhardt:

*Spinning p-Branes*

ITP-UH-27/01

(PhD Thesis)

Bernd Niemeyer:

*N=2 Strings und selbstduale Feldtheorien*

ITP-UH-06/01

(PhD Thesis)

**2000**

Michael Flohr:

*Null vectors in logarithmic conformal field theory *

hep-th/0009137

(Proceedings of the IV. Annual European TMR Conference on Integrability, Non-perturbative Effects and Symmetry in Quantum Field Theory, September 2000, Paris)

Tatiana A. Ivanova and Alexander D. Popov:

*Cech, Dolbeault and de Rham cohomologies in Chern-Simons and BF theories *

hep-th/0101150

(Proceedings of the XXIII Intern. Colloquium on Group Theoretical Methods in Physics, August 2000, Dubna)

**1999**

Olaf Lechtenfeld, Jan Louis, Dieter Lüst and Hermann Nicolai (eds.):

*Strings '99*

(Proceedings of the Conference in Potsdam, Germany, 19-24 July 1999;

Class. Quantum Grav. **17** (2000) 907-1316)

Olaf Lechtenfeld:

*Mathematics and physics of N=2 strings*

hep-th/9912281

(Talk at JINR workshop "Supersymmetries and Quantum Symmetries'', Dubna, Russia, 27-31 July 1999;

Proceedings: SQS '99, pp. 79-89)

Klaus Jünemann:

* Symmetrien des N=2 Strings*

ITP-UH-02/99

(PhD Thesis)

**1998**

Sergei V. Ketov:

*AdS/CFT correspondence and coincident D-6-branes *

hep-th/9812079 (Fortsch. Phys. **48** (2000) 147-150)

Sergei V. Ketov:

*Making manifest the symmetry enhancement for coinciding BPS branes*

hep-th/9806130

(Talk presented at the International Conference STRINGS'98 in Santa Barbara, USA, 22-26 June 1998, and the International Conference "Problems of Quantum Field Theory'' in Dubna, Russia, 13-17 July 1998)

**1997**

Chandrashekar Devchand and Olaf Lechtenfeld:

*On the self-dual geometry of N=2 strings*

hep-th/9801117

(Talk by O.L. at the 31st International Ahrenshoop Symposium on the Theory of Elementary Particles in Buckow, Germany, 2-6 September 1997, at the International Conference "Methods in Field Theory'' in Stara Lesna, Slovakia, 22-26 September 1997, and the String Workshop in Wittenberg, Germany, 14-15 November 1997)

Sergei Ketov:

* The hypermultiplet low-energy effective action, N=2 supersymmetry breaking and confinement*

hep-th/9712152

(Talk at the 31st International Ahrenshoop Symposium on the Theory of Elementrary Particles in Buckow, Germany, 2-6 September 1997, and the String Workshop in Wittenberg, Germany, 14-15 November 1997)

Sergei Ketov:

* Zur Theorie des Confinement*

ITP-UH-30/97 (auf Deutsch, Vortrag im Physikalischen Kolloquium an der Uni-Hannover am 26.11.1997)

Sergei Ketov:

* Do the critical (2,2) strings know about a supergravity in 2+10 dimensions ?*

hep-th/9710086

(Talk at the XII International Congress of Mathematical Physics, 13-19 July, 1997, in Brisbane, Australia, and the 2nd International Conference on Quantum Field Theory and Gravity, July 29 - August 2, 1997, in Tomsk, Russia)

Peter Adamietz:

* Kollektive Feldtheorie und Momentenmethode in Matrixmodellen*

ITP-UH-14/97

(PhD Thesis)

**1996**

Sergei Ketov:

*Self-duality and F theory*

hep-th/9612171

(Talk at the 4th Nordic Meeting `Supersymmetric Field and String Theories', Göteborg, September 1996, and at the `mitteldeutsche' Workshop, Wittenberg, November 1996)

Sergei V. Ketov:

*Solitons, monopoles and duality from Sine-Gordon to Seiberg-Witten*

hep-th/9611209

(Review, unpublished)

Jan Bischoff:

*Moduli und Amplituden des N=2 Strings*

ITP-UH-14/96

(PhD Thesis)

Olaf Lechtenfeld:

*The self-dual critical N=2 string*

hep-th/9607106

(Talk at X Int. Conf. `Problems of Quantum Field Theory', Alushta, Crimea, May 1996:

p.348, Dubna preprint JINR E2-96-369)

Sergei Ketov:

*From N=2 strings to F&M theory*

hep-th/9606142

(Talk at the Int'l Workshop `Integrable Models and Strings', Garbsen, Germany, June 1996:

Nucl. Phys. B (Proc. Suppl.) **52A** (1997) 335)

Gernot Akemann:

*Phasenübergänge in Matrixmodellen*

ITP-UH-02/96

(PhD Thesis)

**1995**

Sergei V. Ketov:

*Conformal field theory*

(monograph, 486 p., World Scientific, Singapore, 1995)

Jan C. Plefka:

*Supersymmetric generalizations of matrix models*

hep-th/960104

(PhD Thesis, DESY 95-234)

Olaf Lechtenfeld:

*Integration measure and spectral flow in the critical N=2 string*

hep-th/9512189

(Talk at 29th Int. Ahrenshoop Symposium on Elem. Particle Theory, Buckow, Germany, 1995:

Nucl. Phys. B (Proc. Suppl.) **49** (1996) 51)

Sergei V. Ketov:

*Unitary representations of exceptional N=7 and N=8 superconformal algebras in terms of free fields*

ITP-UH-26/95

(Talk at 29th Int. Ahrenshoop Symposium on Elem. Particle Theory, Buckow, Germany, 1995:

Nucl. Phys. B (Proc. Suppl.) **49** (1996) 156)

Sergei V. Ketov:

*N=2 string loops and spectral flow*

hep-th/9510005

(Talk at Int. Workshop on Strings, ICTP, Trieste, Italy, 1995)

Sergei V. Ketov:

*On N=4 strings*

(Talk at Int. Conf. "Strings '95", USC, Los Angeles, USA, 1995:

p.285, Proceedings, World Scientific, 1996)

Olaf Lechtenfeld:

*On the BRST cohomology of N=2 strings*

hept-th/9508100

(Talk at Int. Conf. "Strings '95", USC, Los Angeles, USA, 1995:

p.309, Proceedings, World Scientific, 1996)

**1994**

Olaf Lechtenfeld:

*From N=2 fermionic strings to superstrings?*

hep-th/9412242

(Talk at 28th Int. Ahrenshoop Symp. on Elem. Particle Theory, Wendisch-Rietz, Germany, 1994:

p.16, DESY preprint 95-027)

Sergei V. Ketov and Olaf Lechtenfeld:

*Twisting and BRST cohomology of the N=2 string*

(Talk by S.V.K. at the 20th Yamada International Colloquium On Group Theoretical Methods In Physics, July 1994, Toyonaka, Japan:

p.272, Proceedings, World Scientific, 1995)

**1993**

Olaf Lechtenfeld:

*Collective field theory for D=0 matrix models*

hep-th/9312124

(Talk at 27th Int. Ahrenshoop Symp. on Elem. Particle Theory, Wendisch-Rietz, Germany, 1993:

p.32, DESY preprint 94-053)