@article{JETPL.107.673,
    title = {},
    author = {Grigoriev, S. V. and Pshenichnyi, K. A. and ,  and ,  and ,  and ,  and , },
    journal = {JETP Lett.},
    volume = {107},
    issue = {10},
    pages = {640},
    year = {2018},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18100107},
    note = {[Pisma v ZhETF 107, 673 (2018)]}
}