@article{JETPL.102.272,
    title = {},
    author = {Dolganov, P. V. and Dolganov, V. K. and Kats, E. I.},
    journal = {JETP Lett.},
    volume = {102},
    issue = {4},
    pages = {242},
    year = {2015},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15160109},
    note = {[Pisma v ZhETF 102, 272 (2015)]}
}