@article{JETPL.103.568,
    title = {},
    author = {, },
    journal = {JETP Lett.},
    volume = {103},
    issue = {8},
    pages = {504},
    year = {2016},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16080026},
    note = {[Pisma v ZhETF 103, 568 (2016)]}
}