@article{PismaZhETF.2.6,
    title = {Atomic Beam Lasers},
    author = {Basov, N. G. and Letokhov, V. S.},
    journal = {Письма в ЖЭТФ},
    volume = {2},
    issue = {1},
    pages = {6},
    year = {1965},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24443.shtml},
}