@article{JETPL.100.639,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {100},
    issue = {9},
    pages = {561},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1421005X},
    note = {[Pisma v ZhETF 100, 639 (2014)]}
}