@article{JETPL.95.540,
    title = {},
    author = {Zubkov, M. A.},
    journal = {JETP Lett.},
    volume = {95},
    issue = {9},
    pages = {476},
    year = {2012},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29699.shtml},
    note = {[Pisma v ZhETF 95, 540 (2012)]}
}