@article{JETPL.108.170,
    title = {},
    author = {Dolganov, P. V. and Dolganov, V. K.},
    journal = {JETP Lett.},
    volume = {108},
    issue = {3},
    pages = {170},
    year = {2018},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18150043},
    note = {[Pisma v ZhETF 108, 170 (2018)]}
}