@article{PismaZhETF.1.39,
    title = {75-micron laser},
    author = {Petrov, Yu. N. and Prokhorov, A. M.},
    journal = {Письма в ЖЭТФ},
    volume = {1},
    issue = {1},
    pages = {39},
    year = {1965},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24289.shtml},
}