@article{JETPL.93.674, title = {}, author = {Garifullin, I. A.}, journal = {JETP Lett.}, volume = {93}, issue = {10}, pages = {612}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29306.shtml}, note = {[Pisma v ZhETF 93, 674 (2011)]} }