@article{JETPL.103.280, title = {}, author = {, and , and , and , and Volochaev, M. N. and , and , and , and , and , }, journal = {JETP Lett.}, volume = {103}, issue = {4}, pages = {254}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16040081}, note = {[Pisma v ZhETF 103, 280 (2016)]} }