@article{PismaZhETF.3.262,
    title = {Laser with Nonresonant Feedback},
    author = {Ambartsumyan, R. V. and Basov, N. G. and Kryukov, P. G. and Letokhov, V. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {3},
    issue = {6},
    pages = {262},
    year = {1966},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24742.shtml},
}