@article{JETPL.99.743,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {99},
    issue = {11},
    pages = {640},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1411006X},
    note = {[Pisma v ZhETF 99, 743 (2014)]}
}