@article{PismaZhETF.18.413,
    title = {Resonant interaction of wave packets in nonlinear media},
    author = {Zakharov, V. E. and Manakov, S. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {18},
    issue = {7},
    pages = {413},
    year = {1973},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24007.shtml},
}