@article{JETPL.107.512,
    title = {},
    author = {Kagan, M. Yu. and Aksenov, S. V.},
    journal = {JETP Lett.},
    volume = {107},
    issue = {8},
    pages = {493},
    year = {2018},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1808009X},
    note = {[Pisma v ZhETF 107, 512 (2018)]}
}