@article{JETPL.110.81,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {110},
    issue = {2},
    pages = {91},
    year = {2019},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_33540.shtml},
    note = {[Pisma v ZhETF 110, 81 (2019)]}
}