@article{JETPL.104.892, title = {}, author = {, and , and , and , and Lebedev, V. S. and , and , and , }, journal = {JETP Lett.}, volume = {104}, issue = {12}, pages = {883}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16240139}, note = {[Pisma v ZhETF 104, 892 (2016)]} }