@article{JETPL.100.397,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {100},
    issue = {6},
    pages = {355},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_30915.shtml},
    note = {[Pisma v ZhETF 100, 397 (2014)]}
}