参考文献

Bolin, David Robert; Cheung, Adrian Wai-Hing; Firooznia, Fariborz; Hamilton, Matthew Michael; Li, Shiming; McDermott, Lee Apostle; Qian, Yimin; Yun, Weiya Patent: US2007/123504 A1, 2007 ; Location in patent: Page/Page column 12 ; US 20070123504 A1