@article{JETPL.95.664, title = {}, author = {, }, journal = {JETP Lett.}, volume = {95}, issue = {11}, pages = {586}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29754.shtml}, note = {[Pisma v ZhETF 95, 664 (2012)]} }