@article{PismaZhETF.7.260,
    title = {Laser with Combined Active Medium},
    author = {Kaminskii, A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {7},
    issue = {8},
    pages = {260},
    year = {1968},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25636.shtml},
}