@article{JETPL.98.626, title = {}, author = {, and , and Tereshchenko, O. E. and Kokh, K. A. and Chulkov, E. V.}, journal = {JETP Lett.}, volume = {98}, issue = {9}, pages = {557}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1321008X}, note = {[Pisma v ZhETF 98, 626 (2013)]} }