参考文献

Berthel, Steven Joseph; Brinkman, John A.; Hayden, Stuart; Haynes, Nancy-Ellen; Kester, Robert Francis; McDermott, Lee Apostle; Qian, Yimin; Sarabu, Ramakanth; Scott, Nathan Robert; Tilley, Jefferson Wright Patent: US2009/264445 A1, 2009 ; Location in patent: Page/Page column 38 ;