参考文献

Dyckman, Alaric; Pitts, William J.; Belema, Makonen; Gill, Patrice; Kempson, James; Qiu, Yuping; Quesnelle, Claude; Spergel, Steven H.; Zusi, F. Christopher Patent: US2006/106051 A1, 2006 ; Location in patent: Page/Page column 29 ;