@article{JETPL.109.511, title = {}, author = {Belykh, S. F. and Tolstoguzov, A. B. and , and , }, journal = {JETP Lett.}, volume = {109}, issue = {8}, pages = {502}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19080034}, note = {[Pisma v ZhETF 109, 511 (2019)]} }