TY  - JOUR
AU  - V. V. Uchaikin
AU  - V. A. Litvinov
TI  - Nonlinear perturbation theory based on the variational principle: Model examples
JO  - Izvestiya VUZ. Applied Nonlinear Dynamics
PY  - 2018
SP  - 82
EP  - 98
VL  - 26
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVP_2018_26_6_a7/
LA  - ru
ID  - IVP_2018_26_6_a7
ER  -