@article{JETPL.114.699,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {114},
    issue = {10},
    pages = {643},
    year = {2021},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567821220122},
    note = {[Pisma v ZhETF 114, 699 (2021)]}
}