@article{PismaZhETF.9.472,
    title = {Features of Photon Echo in a Gas in the Presence of a Magnetic Field},
    author = {Alekseev, A. I.},
    journal = {Письма в ЖЭТФ},
    volume = {9},
    issue = {8},
    pages = {472},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25391.shtml},
}