@article{JETPL.100.413, title = {}, author = {, and , and Sementsov, D. I.}, journal = {JETP Lett.}, volume = {100}, issue = {6}, pages = {371}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14180040}, note = {[Pisma v ZhETF 100, 413 (2014)]} }