@article{JETPL.109.540, title = {}, author = {, and Popov, V. V. and , and Ivanov, A. A. and Kuznetsov, A. V. and , and , and , }, journal = {JETP Lett.}, volume = {109}, issue = {8}, pages = {529}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19080095}, note = {[Pisma v ZhETF 109, 540 (2019)]} }