@article{JETPL.96.543,
    title = {},
    author = {,  and Shestakov, G. N.},
    journal = {JETP Lett.},
    volume = {96},
    issue = {8},
    pages = {493},
    year = {2012},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29999.shtml},
    note = {[Pisma v ZhETF 96, 543 (2012)]}
}