@article{JETPL.112.9,
    title = {},
    author = {,  and ,  and ,  and , },
    journal = {JETP Lett.},
    volume = {112},
    issue = {1},
    pages = {6},
    year = {2020},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567820130029},
    note = {[Pisma v ZhETF 112, 9 (2020)]}
}