参考文献

Hansen, Marvin Martin; He, John Xiaoqiang; Honigschmidt, Nicholas Allan; Koch, Daniel James; Kohn, Todd Jonathan; Rocco, Vincent Patrick; Spinazze, Patrick Gianpietro; Takeuchi, Kumiko Patent: US2004/6229 A1, 2004 ; Location in patent: Page/Page column 14 ; US 20040006229 A1