TY  - JOUR
AU  - M. N. Yakovlev
TI  - Solvability of a periodic boundary-value problem for a system of first-order ordinary differential equations 

JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1998
SP  - 231
EP  - 241
VL  - 248
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1998_248_a12/
LA  - ru
ID  - ZNSL_1998_248_a12
ER  -