%0 Journal Article
%A V. P. Egorov
%T The extremum principle for the generalized Neumann--Tricomi problem
%J Differencialʹnye uravneniâ
%D 1975
%P 708-712
%V 11
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_4_a12/
%G ru
%F DE_1975_11_4_a12