TY  - JOUR
AU  - M. N. Yakovlev
TI  - Existence of $2^n$ periodic solutions of a system of $n$ differential equations of first order
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 2002
SP  - 247
EP  - 262
VL  - 284
UR  - http://geodesic.mathdoc.fr/item/ZNSL_2002_284_a12/
LA  - ru
ID  - ZNSL_2002_284_a12
ER  -