@article{JETPL.108.563, title = {}, author = {, and , and Popov, V. V. and , and , and , and , and , and , and , }, journal = {JETP Lett.}, volume = {108}, issue = {8}, pages = {532}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18200080}, note = {[Pisma v ZhETF 108, 563 (2018)]} }