@article{JETPL.105.315, title = {}, author = {, and , and Trakhtenberg, L. I. and , and , }, journal = {JETP Lett.}, volume = {105}, issue = {5}, pages = {335}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17050125}, note = {[Pisma v ZhETF 105, 315 (2017)]} }