%0 Journal Article
%A A. A. Lyapunov
%T The covering of $A$-sets, and multiple separability
%J Doklady Akademii Nauk
%D 1970
%P 775-776
%V 190
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_190_4_a8/
%G ru
%F DAN_1970_190_4_a8