@article{JETPL.98.720,
    title = {},
    author = {Shilkin, D. A. and ,  and ,  and Fedyanin, A. A.},
    journal = {JETP Lett.},
    volume = {98},
    issue = {10},
    pages = {644},
    year = {2013},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13220128},
    note = {[Pisma v ZhETF 98, 720 (2013)]}
}