参考文献:
Anderson, Kevin William Fotouhi, Nader Gillespie, Paul Goodnow, Robert Alan Guertin, Kevin Richard Haynes, Nancy-Ellen Myers, Michael Paul Pietranico-Cole, Sherrie Lynn Qi, Lida Rossman, Pamela Loreen Scott, Nathan Robert Thakkar, Kshitij Chhabilbhai Tilley, Jefferson Wright Zhang, Qiang Patent: US2007/225280 A1, 2007 Location in patent: Page/Page column 18 34 US 20070225280 A1