@article{JETPL.96.68,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {96},
    issue = {1},
    pages = {66},
    year = {2012},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29863.shtml},
    note = {[Pisma v ZhETF 96, 68 (2012)]}
}