%0 Journal Article
%A R. Sakamoto
%T Mixed problems for hyperbolic equations. I.~Energy inequalities
%J Matematika
%D 1972
%P 62-80
%V 16
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAT_1972_16_1_a2/
%G ru
%F MAT_1972_16_1_a2