%0 Journal Article %A Misha Bialy %T Convex billiards and a theorem by E. Hops. %J Mathematische Zeitschrift %D 1993 %P 147-154 %V 214 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174561/ %F MZ_1993__214_1_174561