@article{PismaZhETF.7.284,
    title = {Two-quantum Amplification of a Short Light Pulse},
    author = {Letokhov, V. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {7},
    issue = {8},
    pages = {284},
    year = {1968},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25644.shtml},
}