TY  - JOUR
AU  - V. G. Zvyagin
AU  - S. V. Kornev
TI  - Method of guiding functions for existence problems for periodic solutions of differential equations
JO  - Contemporary Mathematics. Fundamental Directions
PY  - 2015
SP  - 59
EP  - 81
VL  - 58
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMFD_2015_58_a3/
LA  - ru
ID  - CMFD_2015_58_a3
ER  -