@article{PismaZhETF.6.589,
    title = {Infrared Laser with .Magnetic Pumping},
    author = {Al'tshuler, S. A. and Zavoiskii, E. K.},
    journal = {Письма в ЖЭТФ},
    volume = {6},
    issue = {4},
    pages = {589},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25338.shtml},
}