with Carlos Ramos Cuevas: The center conjecture for spherical buildings of types F4 and E6, Geometric and Functional Analysis 21 no. 3 (2011), 525-559.

with Jonathan Dinkelbach: Equivariant Ricci flow with surgery and applications to finite group actions on geometric 3-manifolds, Geometry & Topology 13 (2009), 1129-1173.

with Misha Kapovich and John Millson: Polygons in buildings and their refined side lengths, Geometric and Functional Analysis 19, no. 4, 1081-1100 (2009).

with Misha Kapovich and John Millson: Convex functions on symmetric spaces, side lengths of polygons and the stability inequalities for weighted configurations at infinity, Journal of Differential Geometry 81 (2009), 297-354.

with Bruce Kleiner: Induced quasi-actions: A remark, Proceedings of the AMS 137 (2009), 1561-1567.

with Misha Kapovich and John Millson: The generalized triangle inequalities in symmetric spaces and buildings with applications to algebra, Memoirs of the AMS, vol. 896 (2008).

with Bruce Kleiner: Rigidity of invariant convex sets in symmetric spaces, Inventiones Mathematicae 163, no. 3, 657-676 (2006).

Geometrisierung 3-dimensionaler Mannigfaltigkeiten und Ricci-Fluß: Zu Perelmans Beweis der Vermutungen von Poincaré und Thurston, DMV-Mitteilungen 14-4 (2006), 213-221.

with Michel Boileau and Joan Porti: Geometrization of 3-dimensional orbifolds, Annals of Mathematics 162 (2005), 195-290.

with Shrawan Kumar and John Millson: The generalized triangle inequalities for rank 3 symmetric spaces of noncompact type, Contemporary Mathematics 332 (2003), 171-195.