@article{JETPL.101.687,
    title = {},
    author = {,  and ,  and ,  and Fel?dman, E. B. and , },
    journal = {JETP Lett.},
    volume = {101},
    issue = {9},
    pages = {613},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15090064},
    note = {[Pisma v ZhETF 101, 687 (2015)]}
}