@article{JETPL.112.268,
    title = {},
    author = {,  and ,  and ,  and , },
    journal = {JETP Lett.},
    volume = {112},
    issue = {4},
    pages = {250},
    year = {2020},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567820160090},
    note = {[Pisma v ZhETF 112, 268 (2020)]}
}