@article{JETPL.93.493,
    title = {},
    author = {Gusev, A. I.},
    journal = {JETP Lett.},
    volume = {93},
    issue = {8},
    pages = {447},
    year = {2011},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29241.shtml},
    note = {[Pisma v ZhETF 93, 493 (2011)]}
}