@article{PismaZhETF.20.338,
    title = {Singularities of vacuum decay and remarks on tachyons},
    author = {Zel'dovich, Ya. B.},
    journal = {Письма в ЖЭТФ},
    volume = {20},
    issue = {5},
    pages = {338},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27270.shtml},
}