@article{JETPL.108.724, title = {}, author = {, and Belavin, A.}, journal = {JETP Lett.}, volume = {108}, issue = {10}, pages = {705}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18220113}, note = {[Pisma v ZhETF 108, 724 (2018)]} }