Obtuse triangular billiards. I: Near the ( 2 , 3 , 6 ) triangle. Schwartz, Richard Evan — 2006 Experimental Mathematics
Pappus's theorem and the modular group Richard Evan Schwartz — 1993 Publications Mathématiques de l'IHÉS
The quasi-isometry classification of rank one lattices Richard Evan Schwartz — 1995 Publications Mathématiques de l'IHÉS