@article{JETPL.109.525, title = {}, author = {Gus?kov, S. Yu. and , and , and , and Khishchenko, K. V.}, journal = {JETP Lett.}, volume = {109}, issue = {8}, pages = {516}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X1908006X}, note = {[Pisma v ZhETF 109, 525 (2019)]} }