@article{PismaZhETF.30.557,
    title = {On energetically forbidden supersonic collapse regimes of Langmuir oscillations},
    author = {Fraiman, G. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {30},
    issue = {9},
    pages = {557},
    year = {1979},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20693.shtml},
}