@article{JETPL.109.108, title = {}, author = {, and , and , and , and Krivenkov, V. A. and , }, journal = {JETP Lett.}, volume = {109}, issue = {2}, pages = {112}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19020085}, note = {[Pisma v ZhETF 109, 108 (2019)]} }