%0 Journal Article
%A A. S. Kalashnikov
%A O. A. Oleinik
%T I. G. Petrovskii Seminar on Differential Equations and the Mathematical Problems of Physics
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1973
%V 28
%N 5
%U http://geodesic.mathdoc.fr/item/RM_1973_28_5_a25/
%G ru
%F RM_1973_28_5_a25