TY  - JOUR
AU  - V. V. Laricheva
TI  - Averaging for systems with variable period
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 1269
EP  - 1272
VL  - 198
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_198_6_a4/
LA  - ru
ID  - DAN_1971_198_6_a4
ER  -