@article{JETPL.112.501,
    title = {},
    author = {,  and ,  and ,  and ,  and ,  and Nikolaev, S. N. and ,  and , },
    journal = {JETP Lett.},
    volume = {112},
    issue = {8},
    pages = {471},
    year = {2020},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567820200033},
    note = {[Pisma v ZhETF 112, 501 (2020)]}
}