@article{PismaZhETF.7.49,
    title = {Separation of One Mode in a Laser},
    author = {Troitskii, Yu. V. and Goldina, N. D.},
    journal = {Письма в ЖЭТФ},
    volume = {7},
    issue = {2},
    pages = {49},
    year = {1968},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25572.shtml},
}