@article{JETPL.102.399,
    title = {},
    author = {Val?kov, V. V. and ,  and Mitskan, V. A.},
    journal = {JETP Lett.},
    volume = {102},
    issue = {6},
    pages = {361},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15180083},
    note = {[Pisma v ZhETF 102, 399 (2015)]}
}