@article{JETPL.102.620,
    title = {},
    author = {Tikhonov, A. M.},
    journal = {JETP Lett.},
    volume = {102},
    issue = {8},
    pages = {552},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1520014X},
    note = {[Pisma v ZhETF 102, 620 (2015)]}
}