@article{JETPL.96.257,
    title = {},
    author = {,  and Lyubutin, I. S.},
    journal = {JETP Lett.},
    volume = {96},
    issue = {4},
    pages = {240},
    year = {2012},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29899.shtml},
    note = {[Pisma v ZhETF 96, 257 (2012)]}
}