TY  - JOUR
AU  - V. V. Lychagin
TI  - Geometric singularities of solutions of nonlinear differential equations
JO  - Doklady Akademii Nauk
PY  - 1981
SP  - 1299
EP  - 1303
VL  - 261
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1981_261_6_a3/
LA  - ru
ID  - DAN_1981_261_6_a3
ER  -