@article{JETPL.114.199,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {114},
    issue = {4},
    pages = {167},
    year = {2021},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567821160011},
    note = {[Pisma v ZhETF 114, 199 (2021)]}
}