@article{JETPL.108.114, title = {}, author = {, and Gritsenko, V. A.}, journal = {JETP Lett.}, volume = {108}, issue = {2}, pages = {127}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18140096}, note = {[Pisma v ZhETF 108, 114 (2018)]} }