with Stephan Stolz, Mathematical Foundations of Quantum Field Theory and Perturbative String Theory, Proceedings of Symposia in Pure Mathematics,Vl.83, AM.S. 2011, 279-340.

Differential forms and 0-dimensional super symmetric field theories

with Henning Hohnhold, Matthias Kreck and Stephan Stolz, Quantum Topology 2, 2011, 1-41.

Super manifolds - a short and incomplete survey

with Henning Hohnhold and Stephan Stolz, Bulletin of the Manifold Atlas 2011, 1-6.

From minimal geodesics to super symmetric field theories

In memory of Raoul Bott, with Henning Hohnhold and Stephan Stolz

CRM Proceedings and Lecture Notes 50, 2010, 207-273.

Topological 4-manifolds with geometrically 2-dim. fundamental groups

with Ian Hambleton and Matthias Kreck, Journal of Topology and Analysis, vol. 1 (2) 2009, 123-151

New constructions of slice links

with Tim Cochran and Stefan Friedl, Commentarii Math. Helvetici, vol. 84 (3) 2009, 617-638

Positive topological field theories and manifolds of dimension > 4.

with Matthias Kreck, Journal of Topology 1 (2008), 663-670.

Knot concordance and von Neumann rho-invariants

with Tim Cochran, Duke Math. Journal 137, Number 2 (2007), 337-379.

Jacobi identities in low-dimensional topology

with Jim Conant and Rob Schneiderman, Compositio Math. 143 (2007) 780-810.

Non-smoothable four-manifolds with infinite cyclic fundamental group

with Stefan Friedl, Ian Hambleton and Paul Melvin, International Math. Research Notices, Vol. 2007,

Article ID rnm031, 20 pages.

Geometric topology and connections with quantum field theory

Abstracts from the workshop held June 12--18, 2005. Organized by Stephan Stolz and Peter Teichner.

Oberwolfach Reports. Vol. 2, no. 2 (2005), 1505-1546.

What is an elliptic object?

with Stephan Stolz, Topology, geometry and quantum field theory,

London Math. Soc. LNS 308, Cambridge Univ. Press 2004, 247-343.

New topologically slice knots

with Stefan Friedl, Geometry and Topology, Vol.9 (2005), 2129-2158.

Correction to an example in the paper.

On knots with trivial Alexander polynomial

with Stavros Garoufalidis, Journal of Differential Geometry 67 (2004), 763-789.

What is ... a grope?

Notices of the A.M.S. 51 (8) (2004), 892-893.

Whitney towers and the Kontsevich integral

with Rob Schneiderman, Geometry and Topology Monograph 7 (2004), 101-134.

Grope cobordism of classical knots

with Jim Conant, Topology, 43 (2004), 119-156.

Structure in the classical knot concordance group

with Tim Cochran and Kent Orr, Comment. Math. Helv. , 79 (2004), 105-123.

Grope cobordism and Feynman diagrams

with Jim Conant, Math. Annalen, 328 (2004), 135-171.

Knot concordance, Whitney towers and signatures

with Tim Cochran and Kent Orr, Annals of Mathematics 157 (2003), 433-519.

Flatness and the Ore condition for rings

Proceedings of the AMS, 131 (2003), 1977-1980.

Knots, von Neumann signatures, and grope cobordism

Lecture given at the ICM 2002 in Beijing, Proceedings of the International Congress of Math.,

Vol II: Invited Lectures, 437-446.

Higher order intersection numbers of 2-spheres in 4-manifolds

with Rob Schneiderman, Algebraic & Geometric Topology, 1 (2000), 1-29.

All 2-dimensional links are null homotopic

with Arthur Bartels, Geometry and Topology, 3 (1999), 235-252.

Symmetric surgery and boundary link maps

Mathematische Annalen, 312 (1998), 717-735.

Maximal nilpotent quotients of 3-manifold groups

Mathematical Research Letters 4 (1997), 283-293.

Betti number estimates for nilpotent groups

with Michael Freedman and Richard Hain, Fields Medallists' Lectures, edited by M. Atiyah and D. Lagolnitzer, World Sci. Ser. in 20th Century Math. 5 (1997), 413-434.

A non-extended hermitian form over the group ring of the integers

with Ian Hambleton, Manuscripta Mathematica 93 (1997), 435-442.

Alexander duality, gropes and link homotopy

with Slava Krushkal,Geometry and Topology, 1 (1997), 57-69.

On the star-construction for topological 4-manifolds

Proc. of the Georgia International Topology Conference 1993. Geom. top. AMS/IP Stud. Adv. Math. 2 300-312 A.M.S. (1997)

4-manifold topology I

with Michael Freedman, Inventiones Mathematicae 122 (3) (1995), 509-529.

Appendix: Clarification of linear grope height raising.

4-manifold topology II

with Michael Freedman, Inventiones Mathematicae 122 (3) (1995), 531-557.

Counter examples to the Kneser conjecture in dimension four

with Matthias Kreck and Wolfgang Lueck,

Commentarii Mathematici Helvetici 70 (1995), 423-433.

Stable prime decompositions of 4-manifolds

with Matthias Kreck and Wolfgang Lueck, Commentarii Prospects in topology (Princeton, NJ, 1994), 251-269, Ann. of Math. Stud., 138, Princeton Univ. Press, Princeton, NJ, 1995.

6-Dimensional manifolds without totally algebraic homology

Proceedings of the A.M.S. 123 (9) (1995), 2909-2914.

Van Kampen's embedding obstruction is incomplete for 2-complexes in 4-space

with Slava Krushkal and Michael Freedman, Mathematical Research Letters 1 (1994), 167-176.

Nonorientable 4-manifolds with fundamental group of order 2

with Ian Hambleton and Matthias Kreck, Transactions of the A.M.S. 344 (2) (1994), 649-665.

On the signature of 4-manifolds with universal covering spin

Mathematische Annalen 295 (1993), no. 4, 745-759.

Topological 4-manifolds with finite fundamental group

PhD Thesis, University of Mainz, Germany, Shaker Verlag 1992, ISBN 3-86111-182-9.

Unpublished papers

All oriented 4-manifolds have spin-c structures