@article{JETPL.93.105, title = {}, author = {Prudnikov, P. V. and , }, journal = {JETP Lett.}, volume = {93}, issue = {2}, pages = {103}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29120.shtml}, note = {[Pisma v ZhETF 93, 105 (2011)]} }