@article{JETPL.98.69,
    title = {},
    author = {,  and ,  and , },
    journal = {JETP Lett.},
    volume = {98},
    issue = {2},
    pages = {61},
    year = {2013},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13140014},
    note = {[Pisma v ZhETF 98, 69 (2013)]}
}