@article{JETPL.95.672, title = {}, author = {, and Novikov, V. A.}, journal = {JETP Lett.}, volume = {95}, issue = {11}, pages = {594}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29755.shtml}, note = {[Pisma v ZhETF 95, 672 (2012)]} }