@article{JETPL.96.77, title = {}, author = {Yakimov, A. I.}, journal = {JETP Lett.}, volume = {96}, issue = {1}, pages = {75}, year = {2012}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29865.shtml}, note = {[Pisma v ZhETF 96, 77 (2012)]} }