@article{JETPL.95.211, title = {}, author = {, and Ovchinnikov, S. G. and , }, journal = {JETP Lett.}, volume = {95}, issue = {4}, pages = {}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29644.shtml}, note = {[Pisma v ZhETF 95, 211 (2012)]} }