@article{JETPL.94.339,
    title = {},
    author = {Kovalev, V. M. and Chaplik, A. V.},
    journal = {JETP Lett.},
    volume = {94},
    issue = {4},
    pages = {3315},
    year = {2011},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29497.shtml},
    note = {[Pisma v ZhETF 94, 339 (2011)]}
}