@article{JETPL.105.335, title = {}, author = {, and , and , and , and , and Rybin, M. V.}, journal = {JETP Lett.}, volume = {105}, issue = {6}, pages = {352}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17060029}, note = {[Pisma v ZhETF 105, 335 (2017)]} }