@article{JETPL.101.194,
    title = {},
    author = {Kovalev, V. M. and Chaplik, A. V.},
    journal = {JETP Lett.},
    volume = {101},
    issue = {3},
    pages = {},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15030091},
    note = {[Pisma v ZhETF 101, 194 (2015)]}
}