%0 Journal Article
%A A. A. Shishkin
%T Eigen-values and characteristic functions of some fourth order differential operators containing a small parameter in the higher derivative term
%J Doklady Akademii Nauk
%D 1958
%P 249-251
%V 123
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_123_2_a9/
%G ru
%F DAN_1958_123_2_a9