@article{JETPL.106.521, title = {}, author = {, and , and , and Kiiamov, A. G. and , and Tayurskii, D. A. and , and , }, journal = {JETP Lett.}, volume = {106}, issue = {8}, pages = {540}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17200115}, note = {[Pisma v ZhETF 106, 521 (2017)]} }