@article{JETPL.106.755, title = {}, author = {Dyugaev, A. M. and , }, journal = {JETP Lett.}, volume = {106}, issue = {12}, pages = {788}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17240067}, note = {[Pisma v ZhETF 106, 755 (2017)]} }