TY  - JOUR
AU  - A. B. Vasil'eva
AU  - V. A. Tupchiev
TI  - Periodic solutions of systems of differential equations with a small parameter at the derivatives, close to discontinuous ones
JO  - Doklady Akademii Nauk
PY  - 1968
SP  - 767
EP  - 770
VL  - 178
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1968_178_4_a2/
LA  - ru
ID  - DAN_1968_178_4_a2
ER  -