@article{JETPL.93.182, title = {}, author = {Nekrasov, I. A. and , }, journal = {JETP Lett.}, volume = {93}, issue = {3}, pages = {166}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29151.shtml}, note = {[Pisma v ZhETF 93, 182 (2011)]} }