@article{PismaZhETF.16.190,
    title = {Scattering of Light by Light},
    author = {Isaev, P. S. and Khlaskov, V. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {16},
    issue = {3},
    pages = {190},
    year = {1972},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26767.shtml},
}