@article{JETPL.97.215,
    title = {},
    author = {Ruban, V. P.},
    journal = {JETP Lett.},
    volume = {97},
    issue = {4},
    pages = {188},
    year = {2013},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1304005X},
    note = {[Pisma v ZhETF 97, 215 (2013)]}
}