参考文献

Beutel, Bruce A.; Camp, Heidi S.; Clark, Richard F.; Gu, Yu-Gui; Hansen, Todd M.; Keyes, Robert F.; Li, Qun; Liu, Gang; Sham, Hing L.; Wang, Xiaojun; Weitzberg, Moshe; Xin, Zhili; Xu, Xiangdong; Zhang, Tianyuan Patent: US2006/178400 A1, 2006 ; Location in patent: Page/Page column 35 ;