参考文献

Li, James J,; Hamann, Lawrence G.; Ruan, Zheming; Cooper, Christopher B.; Wu, Shung C.; Simpkins, Ligaya M.; Wang, Haixia; Nayeem, Akbar; Krystek, Stanley R. Patent: US2006/235028 A1, 2006 ; Location in patent: Page/Page column 30 ; US 20060235028 A1