@article{JETPL.101.940,
    title = {},
    author = {,  and ,  and , },
    journal = {JETP Lett.},
    volume = {101},
    issue = {12},
    pages = {840},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15120139},
    note = {[Pisma v ZhETF 101, 940 (2015)]}
}