@article{JETPL.105.64,
    title = {},
    author = {Popov, A. Yu. and Gusakov, E. Z.},
    journal = {JETP Lett.},
    volume = {105},
    issue = {2},
    pages = {},
    year = {2017},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17020035},
    note = {[Pisma v ZhETF 105, 64 (2017)]}
}