TY  - JOUR
AU  - E. G. Bam-Zelikovich
TI  - Some necessary conditions for local solvability of first-order differential equations with infinitely differentiable coefficients
JO  - Doklady Akademii Nauk
PY  - 1972
SP  - 267
EP  - 270
VL  - 204
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1972_204_2_a1/
LA  - ru
ID  - DAN_1972_204_2_a1
ER  -