参考文献

Ameriks, Michael K.; Axe, Frank U.; Edwards, James P.; Grice, Cheryl A.; Cai, Hui; Gleason, Elizabeth Ann; Meduna, Steven P.; Tays, Kevin L.; Wiener, John J. M.; Wickboldt, Alvah T. Patent: US2008/200454 A1, 2008 ; Location in patent: Page/Page column 73 ; US 20080200454 A1