@article{PismaZhETF.4.174,
    title = {Rest Mass of Muonic Neutrino and Cosmology},
    author = {Gershtein, S. S. and Zel'dovich, Ya. B.},
    journal = {Письма в ЖЭТФ},
    volume = {4},
    issue = {5},
    pages = {174},
    year = {1966},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24863.shtml},
}