%0 Journal Article
%A V. K. Romanko
%T Boundary-value problems for operators in two variables with non-homogeneous principal part
%J Doklady Akademii Nauk
%D 1964
%P 269-272
%V 159
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1964_159_2_a8/
%G ru
%F DAN_1964_159_2_a8