1. The Combinatorial Geometry of Singularities and Arnold´s Series E, Z, Q (with E. Brieskorn and F. Rothenhäusler), Moscow Mathematical Journal 3 (2003), 273-333, [ps]
2. Traces in Complex Hyperbolic Triangle Groups, Geometriae Dedicata 111 (2005), 159-185, math.DG/0402153 [ps]
3. Topology of m-Spin Structures on Riemann Surfaces (with S. Natanzon), Uspekhi Math. Nauk (Russian Mathematical Surveys) 60 (2005), 169-170.
4. On the Link Space of a Q-Gorenstein Quasi-Homogeneous Surface Singularity, Proceedings of the VIII Workshop on Real and Complex Singularities at CIRM (Luminy), Birkhaeuser 2007, 311-325, [ps]
5. Fundamental Domains in Lorentzian Geometry, Geometriae Dedicata 126 (2007), 155-175, math.DG/0308279, [ps]
6. Higher Arf Functions and Moduli Space of Higher Spin Surfaces (with S. Natanzon), Journal of Lie Theory 19 (2009), 107-148, math.AG/0411375, [ps]
7. Non-Discrete Complex Hyperbolic Triangle Groups of Type (m,m,infinity), Bulletin of the LMS 43 (2011), 359-363, link to the paper, math.DG/1004.5434, preprint version as [pdf].
8. The Combinatorial Geometry of Q-Gorenstein Quasi-Homogeneous Surface Singularities, Differential Geometry and its Applications 29 (2011), 507-515, link to the paper, math.DG/1006.4021, preprint version as [pdf].
9. Moduli Spaces of Gorenstein Quasi-Homogeneous Surface Singularities (with S. Natanzon), Russian Mathematical Reviews 66 (2011), 1009-1011, link to the paper.
10. Topological Invariants and Moduli Spaces of Gorenstein Quasi-Homogeneous Surface Singularities (with S. Natanzon), preprint, submitted, math.AG/1010.1111, [pdf]
11. Real Forms of Higher Spin Surfaces (with S. Natanzon), in preparation.
Über Fundamentalbereiche diskreter Untergruppen von SU(1,1) [On Fundamental Domains of Discrete Subgroups of SU(1,1)], Diploma Thesis, University of Bonn, 1998 [ps]
Polyedrische Fundamentalbereiche diskreter Untergruppen von SU(1,1)~ [Polyhedral Fundamental Domains of Discrete Subgroups of SU(1,1)~], Ph.D. Thesis, University of Bonn, 2001, published in Bonner Mathematische Schriften Nr. 346, Bonn 2001 [ps]