@article{JETPL.103.138, title = {}, author = {, and , and Bondarenko, S. and , and , and , and , and , and , and , }, journal = {JETP Lett.}, volume = {103}, issue = {2}, pages = {131}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16020119}, note = {[Pisma v ZhETF 103, 138 (2016)]} }