@article{JETPL.105.340, title = {}, author = {, and Gusev, A. I.}, journal = {JETP Lett.}, volume = {105}, issue = {6}, pages = {357}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17060030}, note = {[Pisma v ZhETF 105, 340 (2017)]} }