TY  - JOUR
AU  - Peter D. Lax
TI  - On Cauchy's problem for hyperbolic equations and the differentiability of solutions of elliptic equations
JO  - Matematika
PY  - 1957
SP  - 43
EP  - 59
VL  - 1
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a3/
LA  - ru
ID  - MAT_1957_1_1_a3
ER  -