@article{PismaZhETF.11.340,
    title = {Four-Photon Scattering in a Resonant Medium},
    author = {Kirin, Yu. M. and Rautian, S. G. and Semenov, A. E. and Chernoborod, B. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {11},
    issue = {7},
    pages = {340},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26129.shtml},
}