@article{PismaZhETF.6.609,
    title = {Bremsstrahlung Spectrum of a Fast Electron in a Single Crystal},
    author = {Kalashnikov, N. P. and Ryazanov, M. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {6},
    issue = {4},
    pages = {609},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25345.shtml},
}