@article{JETPL.106.52,
    title = {},
    author = {,  and ,  and ,  and ,  and ,  and , },
    journal = {JETP Lett.},
    volume = {106},
    issue = {1},
    pages = {51},
    year = {2017},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17130112},
    note = {[Pisma v ZhETF 106, 52 (2017)]}
}