参考文献:
Allison, Brett D. Gomez, Laurent Grice, Cheryl A. Hack, Michael D. Morrow, Brian J. Motley, S. Timothy Santillan, Alejandro Shaw, Karen J. Schwarz, Kimberly L. Tang, Liu Y. Venkatesan, Hariharan Wiener, John J. M. Patent: US6/38 A, 6 Location in patent: Page/Page column 8