%0 Journal Article
%A V. V. Zimoglyad
%T Letter to the Editor
%J Sbornik. Mathematics
%D 1972
%P 182
%V 17
%N 1
%U http://geodesic.mathdoc.fr/item/SM_1972_17_1_a8/
%G en
%F SM_1972_17_1_a8