TY  - JOUR
AU  - L. N. Karmov
TI  - The method of differentiation with respect to a parameter as applied to the problem of determining periodic solutions of differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1970
SP  - 569
EP  - 570
VL  - 6
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1970_6_3_a22/
LA  - ru
ID  - DE_1970_6_3_a22
ER  -