@article{JETPL.94.220, title = {}, author = {, and , and Gritsenko, V. A.}, journal = {JETP Lett.}, volume = {94}, issue = {3}, pages = {202}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29474.shtml}, note = {[Pisma v ZhETF 94, 220 (2011)]} }