@article{JETPL.94.210, title = {}, author = {Ovchinnikov, S. G.}, journal = {JETP Lett.}, volume = {94}, issue = {3}, pages = {192}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29472.shtml}, note = {[Pisma v ZhETF 94, 210 (2011)]} }