@article{JETPL.98.962, title = {}, author = {, and , and , and Xue, Z.-Y.}, journal = {JETP Lett.}, volume = {98}, issue = {12}, pages = {858}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1324020X}, note = {[Pisma v ZhETF 98, 962 (2013)]} }