TY  - JOUR
AU  - O. A. Oleinik
AU  - E. V. Radkevich
TI  - Systems of differential equations that have nonanalytic solutions
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1972
VL  - 27
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1972_27_5_a21/
LA  - ru
ID  - RM_1972_27_5_a21
ER  -