@article{JETPL.94.95, title = {}, author = {, and Kitaeva, G. Kh.}, journal = {JETP Lett.}, volume = {94}, issue = {2}, pages = {91}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29437.shtml}, note = {[Pisma v ZhETF 94, 95 (2011)]} }