@article{JETPL.96.568, title = {}, author = {Tikhonov, A. M. and , and , }, journal = {JETP Lett.}, volume = {96}, issue = {8}, pages = {517}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_30004.shtml}, note = {[Pisma v ZhETF 96, 568 (2012)]} }