@article{PismaZhETF.61.142,
    title = {Deformation of some integrable equations},
    author = {Ivanova, T. A. and Popov, A. D.},
    journal = {Письма в ЖЭТФ},
    volume = {61},
    issue = {2},
    pages = {142},
    year = {1995},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18071.shtml},
}