TY  - JOUR
AU  - M. A. Krasnosel'skii
TI  - The theory of periodic solutions of non-autonomous differential equations
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1966
SP  - 53
EP  - 74
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1966_21_3_a1/
LA  - en
ID  - RM_1966_21_3_a1
ER  -