%0 Journal Article
%A M. M. Khapaev
%T Singular differential equations in problems on the investigation
%J Doklady Akademii Nauk
%D 1992
%P 250-252
%V 323
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a12/
%G ru
%F DAN_1992_323_2_a12