@article{PismaZhETF.20.393,
    title = {Frequency beats between orthogonal polarizations in a water-vapor laser},
    author = {Zav'yalov, V. V. and Bogomolov, G. D.},
    journal = {Письма в ЖЭТФ},
    volume = {20},
    issue = {6},
    pages = {393},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27286.shtml},
}