@article{PismaZhETF.4.180,
    title = {Coherent Amplification of Radio Emission in a Cosmic Medium},
    author = {Varshalovich, D. A.},
    journal = {Письма в ЖЭТФ},
    volume = {4},
    issue = {5},
    pages = {180},
    year = {1966},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24865.shtml},
}