%0 Journal Article
%A V. S. Serov
%T The Friedrichs extension of a differential operator with a singularity
%J Differencialʹnye uravneniâ
%D 1985
%P 1422-1429
%V 21
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1985_21_8_a16/
%G ru
%F DE_1985_21_8_a16