@article{JETPL.104.820,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {104},
    issue = {11},
    pages = {800},
    year = {2016},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16230119},
    note = {[Pisma v ZhETF 104, 820 (2016)]}
}