%0 Journal Article %A E. Leuzinger %T Tits Geometry, Arithmetic Groups, and the Proof of a Conjecture of Siegel %J Journal of Lie Theory %D 2004 %P 317-338 %V 14 %N 2 %U http://geodesic.mathdoc.fr/item/JOLT_2004_14_2_a0/ %F JOLT_2004_14_2_a0