@article{JETPL.109.48, title = {}, author = {, and , and Krasavin, A. V. and , and , }, journal = {JETP Lett.}, volume = {109}, issue = {1}, pages = {45}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19010090}, note = {[Pisma v ZhETF 109, 48 (2019)]} }