@article{JETPL.102.739,
    title = {},
    author = {Ruban, V. P.},
    journal = {JETP Lett.},
    volume = {102},
    issue = {10},
    pages = {650},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1522004X},
    note = {[Pisma v ZhETF 102, 739 (2015)]}
}