@article{JETPL.98.261, title = {}, author = {, and Kats, E. I. and , and , and , and , }, journal = {JETP Lett.}, volume = {98}, issue = {4}, pages = {233}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/0/article_30401.shtml}, note = {[Pisma v ZhETF 98, 261 (2013)]} }