• Homomorphisms to R constructed from random walks (pdf)
  (with A. Erschler) Preprint.
  
  
• Noncommutative ergodic theorems (pdf)
  (with F. Ledrappier) To appear in the Bob Zimmer Festschrift (eds. Farb and Fisher).
  
  
• Zeta functions, heat kernels and spectral invariants under degeneration of discrete tori (pdf)
  (with G. Chinta and J. Jorgenson) To appear in Nagoya Math. J.
  
  
• Strong law of large numbers with concave moments (pdf)
  (with N. Monod) Not for publication.
  
  
• Ergodic theorems for noncommuting random products (pdf)
  Lecture notes from Santiago and Wroclaw.
  
  
• Applications of heat kernels on abelian groups:
  ζ(2n), quadratic reciprocity, Bessel integrals (pdf)
  To appear in The Serge Lang Memorial Volume, Springer Verlag
  
  
• Superrigidity, generalized harmonic maps, and uniformly convex spaces (pdf)
  (with T. Gelander and G.A. Margulis) GAFA. 17 (2008) 1524-1550
  
  
• Propriété de Liouville et vitesse de fuite du mouvement Brownien (preprint, scidirect)
  (with F. Ledrappier) C. R. Acad. Sci. Paris, Ser. I 344 (2007) 685-690
  
  
• Linear drift and Poisson boundary for random walks (pdf, PAMQ)
  (with F. Ledrappier) Pure Appl. Math. Q. 3 (2007) 1027-1036
  
  
• The Poisson boundary of Lamplighter random walks on trees (pdf, LINK)
  (with W. Woess) Geom. Dedicata, 124 (2007) 95-107
  
  
• Volumes of ideal simplices in Hilbert's geometry and symmetric spaces (pdf)
  (with M. Bucher-Karlsson) In: Guido's Book of Conjectures, I. Chatterji (ed.)
  l'Enseign. Math. (2008) pp. 53-55
  
  
• Heat kernels, theta identities, and zeta functions on cyclic groups (pdf)
  (with M. Neuhauser) In: Topological and Asymptotic Aspects of Group Theory,
  R. Grigorchuk, M. Mihalik, M. Sapir, Z. Sunik (eds.),
  Contemporary Mathematics, 394 (2006) pp. 177-189
  
  
• Laws of large numbers for random walks (pdf, aop)
  (with F. Ledrappier) Annals of Probability, 34 (2006) 1693-1706.
  
  
• Horoballs in simplices and Minkowski spaces (pdf, reprint)
  (with V. Metz and G. Noskov) Int. J. Math. Math. Sci. (2006) 20 pp.
  
  
• On the dynamics of isometries (pdf)
  Geometry & Topology, 9 (2005) 2359-2394.
  
  
• Hilbert metrics and Minkowski norms (pdf)
  (with T. Foertsch) Journal of Geometry, 83 (2005) 22-31.
  
  
• The Bass conjecture and growth in groups (pdf)
  (with M. Neuhauser) Colloq. Math. 100 (2004) 23-27.
  
  
• Some remarks concerning harmonic functions on homogeneous graphs (pdf)
  In: Discrete Random Walks, Cyril Banderier and Christian Krattenthaler (eds.),
  Discrete Mathematics and Theoretical Computer Science Proceedings AC, (2003) pp. 137-144
  
  
• Some groups having only elementary actions on metric spaces
  with hyperbolic boundaries (pdf)
  (with G. Noskov) Geom. Dedicata, 104 (2004) 119-137.
  
  
• Free subgroups of groups with nontrivial Floyd boundary (pdf)
  Comm. Algebra, 31 (2003) 5361-5376.
  
  
• On the definition of bolic spaces (pdf)
  (with M. Bucher) Expo. Math. 20 (2002) 269-277.
  
  
• Boundaries and random walks on finitely generated infinite groups (pdf, addendum)
  Arkiv för Matematik, 41 (2003) 295-306.
  
  
• Linear rate of escape and convergence in directions (pdf)
  In: Proceedings of a Workshop at the Schrödinger Institute, Vienna 2001,
  (Ed. by V.A. Kaimanovich, in collab. with K. Schmidt, W. Woess) de Gruyter, 2004.
  
  
• Hilbert's metric and Gromov hyperbolicity (pdf)
  (with G. Noskov) L'Enseign. Math. 48 (2002) 73-89.
  
  
• Nonexpanding maps, Busemann functions and Multiplicative ergodic theory (pdf)
  In: Proceedings of the Workshop in Ergodic theory, Geometric rigidity and Number theory,
  Newton Institute, Cambridge, (Eds. M. Burger and A. Iozzi) 283-294, Springer Verlag, 2002.
  
  
• Nonexpanding maps and Busemann functions (CUP:etds)
  Erg. Th. & Dyn. Sys. 21 (2001) 1447-1457.
  
  
• An alternative proof of the subadditive ergodic theorem (pdf)
  Unpublished manuscript.
  
  
• A multiplicative ergodic theorem and nonpositively curved spaces (LINK)
  (with G. Margulis) Comm. Math. Phys. 208 (1999) 107-123.