@article{PismaZhETF.4.426,
    title = {Interference of Different Frequencies in Bremsstrahlung},
    author = {Zel'dovich, Ya. B.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {4},
    issue = {10},
    pages = {426},
    year = {1966},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25057.shtml},
}