%0 Journal Article
%A V. V. Vedyushkina
%T Orbital invariants of flat billiards bounded by arcs of confocal quadrics and containing focuses
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 2021
%P 48-51
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_2021_4_a8/
%G ru
%F VMUMM_2021_4_a8