@article{JETPL.97.769,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {97},
    issue = {12},
    pages = {667},
    year = {2013},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13120035},
    note = {[Pisma v ZhETF 97, 769 (2013)]}
}