%0 Journal Article
%A F. G. Maksudov
%A I. V. Aliev
%T Second-order operator-differential equations with nonregular
%J Doklady Akademii Nauk
%D 1991
%P 539-542
%V 320
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_320_3_a5/
%G ru
%F DAN_1991_320_3_a5