@article{JETPL.106.351, title = {}, author = {, and , and Gavrilkin, S. Yu. and , and Trakhtenberg, L. I.}, journal = {JETP Lett.}, volume = {106}, issue = {6}, pages = {378}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17180060}, note = {[Pisma v ZhETF 106, 351 (2017)]} }