%0 Journal Article
%A V. V. Fokicheva
%T Description of singularities for system “billiard in an ellipse”
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 2012
%P 31-34
%N 5
%U http://geodesic.mathdoc.fr/item/VMUMM_2012_5_a5/
%G ru
%F VMUMM_2012_5_a5