@article{JETPL.100.494,
    title = {},
    author = {,  and ,  and , },
    journal = {JETP Lett.},
    volume = {100},
    issue = {7},
    pages = {439},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14190059},
    note = {[Pisma v ZhETF 100, 494 (2014)]}
}