参考文献
Boyd, Edward; Brookfield, Frederick; Gridley, Jonathan; Kubbies, Manfred; Lau, Raymond; Reiff, Ulrike; Tiefenthaler, Georg; von der Saal, Wolfgang; von Hirschheydt, Thomas; Woodcock, Timothy
Patent: US2007/10564 A1, 2007 ;
Location in patent: Page/Page column 14; 19 ;