@article{PismaZhETF.21.585,
    title = {Soft excitation of stimulated two-photon emission},
    author = {Krochik, G. M. and Khronopulo, Yu. G.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {21},
    issue = {10},
    pages = {585},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22494.shtml},
}