@article{JETPL.108.657,
    title = {},
    author = {Nekrasov, I. A. and Pavlov, N. S.},
    journal = {JETP Lett.},
    volume = {108},
    issue = {9},
    pages = {623},
    year = {2018},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18210105},
    note = {[Pisma v ZhETF 108, 657 (2018)]}
}