参考文献:
Berthel, Steven Joseph Erickson, Shawn David Fotouhi, Nader Kester, Robert Francis Kim, Kyungjin Mischke, Steven Gregory Qian, Yimin Thakkar, Kshitij Chhabilbhai Tilley, Jefferson Wright Wang, Hong Patent: US007/76 A, 007 Location in patent: Page/Page column 9 US 0070076 A