@article{PismaZhETF.9.501,
    title = {$YAlO_3$ with $Tr^{3+}$ Ion Impurity as an Active Laser medium},
    author = {Bagdasarov, Kh. S. and Kaminskii, A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {9},
    issue = {9},
    pages = {501},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26785.shtml},
}