@article{JETPL.106.762,
    title = {},
    author = {Val?kov, V. V. and Mitskan, V. A. and Shustin, M. S.},
    journal = {JETP Lett.},
    volume = {106},
    issue = {12},
    pages = {798},
    year = {2017},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17240080},
    note = {[Pisma v ZhETF 106, 762 (2017)]}
}