@article{JETPL.98.952,
    title = {},
    author = {,  and ,  and ,  and , },
    journal = {JETP Lett.},
    volume = {98},
    issue = {12},
    pages = {848},
    year = {2013},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_30590.shtml},
    note = {[Pisma v ZhETF 98, 952 (2013)]}
}