@article{JETPL.94.3, title = {}, author = {Matveev, V. I. and Makarov, D. N.}, journal = {JETP Lett.}, volume = {94}, issue = {1}, pages = {1}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29420.shtml}, note = {[Pisma v ZhETF 94, 3 (2011)]} }