@article{JETPL.107.232, title = {}, author = {, and , and , and Ivanov, A. A. and , and , and , and , and , and , and , and , }, journal = {JETP Lett.}, volume = {107}, issue = {4}, pages = {228}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18040057}, note = {[Pisma v ZhETF 107, 232 (2018)]} }