%0 Journal Article
%A A. F. Lapko
%T At the USSR Academy of Sciences
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1964
%V 19
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1964_19_3_a10/
%G ru
%F RM_1964_19_3_a10