%0 Journal Article
%A VIDAR THOMÉE
%T Estimates of the Friedrichs -Lewy type for a hyperbolic equation with three characteristics
%J Mathematica Scandinavica
%D 1955
%P 115-123
%V 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1955__3_165574/
%F MS2_1955__3_165574