@article{JETPL.105.594, title = {}, author = {Popel, S. I. and Golub?, A. P. and , and , }, journal = {JETP Lett.}, volume = {105}, issue = {10}, pages = {635}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17100034}, note = {[Pisma v ZhETF 105, 594 (2017)]} }