%0 Journal Article
%A G. A. Gal'perin
%T On systems of perfectly elastic balls moving in space or in a box
%J Doklady Akademii Nauk
%D 1979
%P 285-288
%V 245
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1979_245_2_a1/
%G ru
%F DAN_1979_245_2_a1