@article{JETPL.99.832,
    title = {},
    author = {Molotkov, S. N.},
    journal = {JETP Lett.},
    volume = {99},
    issue = {12},
    pages = {720},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14120108},
    note = {[Pisma v ZhETF 99, 832 (2014)]}
}