@article{PismaZhETF.7.3,
    title = {Hysteresis and "Hard"  Excitation in a Gas Laser},
    author = {Lisitsyn, V. N. and Chebotaev, V. P.},
    journal = {Письма в ЖЭТФ},
    volume = {7},
    issue = {1},
    pages = {3},
    year = {1968},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25558.shtml},
}