@article{ZVMMF_2009_49_12_a7,
     author = {S. P. Popov},
     title = {Perturbed soliton solutions of the {sine-Gordon} equation},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {2182--2188},
     publisher = {mathdoc},
     volume = {49},
     number = {12},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_12_a7/}
}