@article{JETPL.105.47,
    title = {},
    author = {Troitsky, S. V.},
    journal = {JETP Lett.},
    volume = {105},
    issue = {1},
    pages = {55},
    year = {2017},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1701012X},
    note = {[Pisma v ZhETF 105, 47 (2017)]}
}