@article{JETPL.93.629, title = {}, author = {, and , and Trofimov, A. D.}, journal = {JETP Lett.}, volume = {93}, issue = {10}, pages = {568}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29297.shtml}, note = {[Pisma v ZhETF 93, 629 (2011)]} }