@article{JETPL.113.448,
    title = {},
    author = {, },
    journal = {JETP Lett.},
    volume = {113},
    issue = {7},
    pages = {445},
    year = {2021},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567821070041},
    note = {[Pisma v ZhETF 113, 448 (2021)]}
}