参考文献
Berthel, Steven Joseph; Haynes, Nancy-Ellen; Kester, Robert Francis; McDermott, Lee Apostle; Qian, Yimin; Sarabu, Ramakanth; Scott, Nathan Robert; Tilley, Jefferson Wright
Patent: US2009/264434 A1, 2009 ;
Location in patent: Page/Page column 45-46 ;