TY  - JOUR
AU  - O. A. Oleinik
AU  - E. V. Radkevich
TI  - On local smoothness of generalized and hypoellipticity of second order differential equations
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1971
SP  - 139
EP  - 156
VL  - 26
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1971_26_2_a8/
LA  - en
ID  - RM_1971_26_2_a8
ER  -