@article{JETPL.100.510,
    title = {},
    author = {Val?kov, V. V. and Shustin, M. S.},
    journal = {JETP Lett.},
    volume = {100},
    issue = {7},
    pages = {455},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14190084},
    note = {[Pisma v ZhETF 100, 510 (2014)]}
}