@article{JETPL.97.693,
    title = {},
    author = {Molotkov, S. N.},
    journal = {JETP Lett.},
    volume = {97},
    issue = {10},
    pages = {604},
    year = {2013},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1310010X},
    note = {[Pisma v ZhETF 97, 693 (2013)]}
}