@article{JETPL.96.865,
    title = {},
    author = {Kovalev, V. M. and Chaplik, A. V.},
    journal = {JETP Lett.},
    volume = {96},
    issue = {12},
    pages = {775},
    year = {2012},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_30123.shtml},
    note = {[Pisma v ZhETF 96, 865 (2012)]}
}