@article{JETPL.101.777,
    title = {},
    author = {Bykov, A. A. and ,  and ,  and Grigoriev, S. V.},
    journal = {JETP Lett.},
    volume = {101},
    issue = {10},
    pages = {699},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15100094},
    note = {[Pisma v ZhETF 101, 777 (2015)]}
}