@article{PismaZhETF.13.281,
    title = {Heavy Leptons and Neutrino Astronomy},
    author = {Pontecorvo, B.},
    journal = {Письма в ЖЭТФ},
    volume = {13},
    issue = {6},
    pages = {281},
    year = {1971},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24081.shtml},
}