@article{JETPL.108.702, title = {}, author = {, and Zubkov, M. A.}, journal = {JETP Lett.}, volume = {108}, issue = {10}, pages = {670}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18220058}, note = {[Pisma v ZhETF 108, 702 (2018)]} }