参考文献

Burgoon, Hugh Alfred; Goodwin, Nicole Cathleen; Harrison, Bryce Alden; Healy, Jason Patrick; Liu, Ying; Mabon, Ross; Marinelli, Brett; Rawlins, David Brent; Rice, Dennis Stewart; Whitlock, Norris Andrew Patent: US2009/264450 A1, 2009 ; Location in patent: Page/Page column 8 ; US 20090264450 A1