%0 Book Section %A de la Harpe, P. %A Voiculescu, D. %T A problem on the $II_1$-factors of Fuchsian groups %B Recent advances in operator algebras - Orléans, 1992 %A Collectif %S Astérisque %D 1995 %P 155-158 %N 232 %I Société mathématique de France %U http://www.numdam.org/item/AST_1995__232__155_0/ %G en %F AST_1995__232__155_0