@article{JETPL.104.18,
    title = {},
    author = {Fomin, I. A.},
    journal = {JETP Lett.},
    volume = {104},
    issue = {1},
    pages = {20},
    year = {2016},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16130051},
    note = {[Pisma v ZhETF 104, 18 (2016)]}
}