TY  - JOUR
AU  - VIDAR THOMÉE
TI  - Estimates of the Friedrichs -Lewy type for a hyperbolic equation with three characteristics
JO  - Mathematica Scandinavica
PY  - 1955
SP  - 115
EP  - 123
VL  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1955__3_165574/
ID  - MS2_1955__3_165574
ER  -