@article{JETPL.110.557, title = {}, author = {, and Lyubutin, I. S. and Chareev, D. A. and , }, journal = {JETP Lett.}, volume = {110}, issue = {8}, pages = {562}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19200086}, note = {[Pisma v ZhETF 110, 557 (2019)]} }