@article{JETPL.110.539,
    title = {},
    author = {Dolganov, P. V. and Shuravin, N. S. and Kats, E. I. and Dolganov, V. K.},
    journal = {JETP Lett.},
    volume = {110},
    issue = {8},
    pages = {545},
    year = {2019},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19200050},
    note = {[Pisma v ZhETF 110, 539 (2019)]}
}