@article{JETPL.108.510, title = {}, author = {Chtchelkatchev, N. M. and Ryltsev, R. E. and , and , }, journal = {JETP Lett.}, volume = {108}, issue = {7}, pages = {476}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18190104}, note = {[Pisma v ZhETF 108, 510 (2018)]} }