%0 Journal Article
%A Kh. A. Abduvaitov
%A È. M. Muhamadiev
%T Invertibility conditions for a second order differential operator
%J Differencialʹnye uravneniâ
%D 1977
%P 2115-2123
%V 13
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_12_a0/
%G ru
%F DE_1977_13_12_a0