Euclidean simplices generating discrete reflection groups
  Let $P$ be a convex polytope in the Euclidean space $\E^n$.   Consider the group $G_P$ generated by reflections in the facets of $P$. We say that $P$ {\it generates a reflection group $G_P$}. In the present paper, we list all Euclidean simplices generating discrete reflection groups. 
Anna Felikson, Pavel Tumarkin