@article{JETPL.108.161, title = {}, author = {Osipov, A. A.}, journal = {JETP Lett.}, volume = {108}, issue = {3}, pages = {161}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X1815002X}, note = {[Pisma v ZhETF 108, 161 (2018)]} }