@article{JETPL.108.725, title = {}, author = {, and Belavin, A. and , }, journal = {JETP Lett.}, volume = {108}, issue = {10}, pages = {710}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18220125}, note = {[Pisma v ZhETF 108, 725 (2018)]} }