@article{JETPL.99.586,
    title = {},
    author = {,  and , },
    journal = {JETP Lett.},
    volume = {99},
    issue = {9},
    pages = {503},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14090021},
    note = {[Pisma v ZhETF 99, 586 (2014)]}
}