@article{JETPL.103.469,
    title = {},
    author = {Balygin, K. A. and ,  and Kulik, S. P. and Molotkov, S. N.},
    journal = {JETP Lett.},
    volume = {103},
    issue = {6},
    pages = {420},
    year = {2016},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16060114},
    note = {[Pisma v ZhETF 103, 469 (2016)]}
}