@article{JETPL.104.576, title = {}, author = {, and Sadovnikov, A. V. and , and , and , and Nikitov, S. A.}, journal = {JETP Lett.}, volume = {104}, issue = {8}, pages = {563}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1620008X}, note = {[Pisma v ZhETF 104, 576 (2016)]} }