%0 Journal Article
%A N. P. Kuptsov
%T Conditions for non-selfadjointness of a second-order linear differential operator
%J Doklady Akademii Nauk
%D 1961
%P 767-770
%V 138
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_138_4_a6/
%G ru
%F DAN_1961_138_4_a6