@article{JETPL.95.676, title = {}, author = {, and Kuznetsov, A. S.}, journal = {JETP Lett.}, volume = {95}, issue = {11}, pages = {598}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29756.shtml}, note = {[Pisma v ZhETF 95, 676 (2012)]} }