@article{PismaZhETF.49.431,
    title = {Ultrastrong wave collapse},
    author = {Zakharov, V. E. and Kosmatov, N. E. and Shvets, V. F.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {49},
    issue = {8},
    pages = {431},
    year = {1989},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16945.shtml},
}