@article{JETPL.105.533,
    title = {},
    author = {, },
    journal = {JETP Lett.},
    volume = {105},
    issue = {9},
    pages = {561},
    year = {2017},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17090028},
    note = {[Pisma v ZhETF 105, 533 (2017)]}
}