@article{MZM_1988_44_5_a14,
     author = {L. A. Kalyakin},
     title = {Local resonance in a weakly nonlinear problem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {697--699},
     publisher = {mathdoc},
     volume = {44},
     number = {5},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_44_5_a14/}
}