%0 Journal Article
%A M. I. Vishik
%A L. Lusternik
%T On elliptical equations containing small parameters in the terms with higher derivatives
%J Doklady Akademii Nauk
%D 1957
%P 734-737
%V 113
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a2/
%G ru
%F DAN_1957_113_4_a2