@article{JETPL.96.18, title = {}, author = {Vitukhnovsky, A. G. and , and , and , and , and , }, journal = {JETP Lett.}, volume = {96}, issue = {1}, pages = {17}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29853.shtml}, note = {[Pisma v ZhETF 96, 18 (2012)]} }