%0 Journal Article
%A V. V. Fokicheva
%T Description of singularities for billiard systems bounded by confocal ellipses or hyperbolas
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 2014
%P 18-27
%N 4
%U http://geodesic.mathdoc.fr/item/VMUMM_2014_4_a2/
%G ru
%F VMUMM_2014_4_a2