@article{JETPL.102.630,
    title = {},
    author = {,  and ,  and , },
    journal = {JETP Lett.},
    volume = {102},
    issue = {8},
    pages = {561},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_31471.shtml},
    note = {[Pisma v ZhETF 102, 630 (2015)]}
}