@article{JETPL.108.689,
    title = {},
    author = {Pekh, P. L. and Ratnikov, P. V.},
    journal = {JETP Lett.},
    volume = {108},
    issue = {10},
    pages = {653},
    year = {2018},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18220010},
    note = {[Pisma v ZhETF 108, 689 (2018)]}
}