@article{JETPL.103.433,
    title = {},
    author = {Val?kov, V. V. and Dzebisashvili, D. M. and Korovushkin, M. M. and , },
    journal = {JETP Lett.},
    volume = {103},
    issue = {6},
    pages = {385},
    year = {2016},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16060047},
    note = {[Pisma v ZhETF 103, 433 (2016)]}
}