@article{JETPL.109.552, title = {}, author = {, and , and Gerashchenko, A. P. and , and , and , and , and , }, journal = {JETP Lett.}, volume = {109}, issue = {8}, pages = {541}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19080113}, note = {[Pisma v ZhETF 109, 552 (2019)]} }