TY  - JOUR
AU  - E. V. Radkevich
TI  - The smoothness of solutions of the first boundary value problem for second order differential equations with a~non-negative characteristic form
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1969
VL  - 24
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1969_24_3_a15/
LA  - ru
ID  - RM_1969_24_3_a15
ER  -