@article{JETPL.96.201, title = {}, author = {, and Kozlov, V. I. and Toropov, A. A. and , and , and , }, journal = {JETP Lett.}, volume = {96}, issue = {3}, pages = {188}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29875.shtml}, note = {[Pisma v ZhETF 96, 201 (2012)]} }