@article{PismaZhETF.22.364,
    title = {Instability and nonlinear oscillations of solitons},
    author = {Zakharov, V. E.},
    journal = {Письма в ЖЭТФ},
    volume = {22},
    issue = {7},
    pages = {364},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23342.shtml},
}