@article{SEMR_2018_15_a145,
     author = {V. I. Kachalov and Yu. S. Fedorov},
     title = {On the method of a small parameter in nonlinear mathematical physics},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {1680--1686},
     publisher = {mathdoc},
     volume = {15},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2018_15_a145/}
}