@article{PismaZhETF.50.405,
    title = {Interference of fields with frequencies $\omega$ and $2\omega$ in external photoelectric effect},
    author = {Zel'dovich, B. Ya. and Chudinov, A. N.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {50},
    issue = {10},
    pages = {405},
    year = {1989},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17142.shtml},
}