参考文献

Uehling, David Edward; Hubbard, Robert Dale; Waterson, Alex Gregory; Petrov, Kimberly; Bifulco, JR., Neil; Wilson, Joseph Wendell; Badiang, Jennifer Gabriel; Cheung, Mui; Yamabe, Mariko Patent: US2009/149456 A1, 2009 ; Location in patent: Page/Page column 76 ;