@article{JETPL.95.550,
    title = {},
    author = {Ruban, V. P.},
    journal = {JETP Lett.},
    volume = {95},
    issue = {9},
    pages = {486},
    year = {2012},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_29701.shtml},
    note = {[Pisma v ZhETF 95, 550 (2012)]}
}