参考文献
Courtney, Stephen Martin; Whittaker, Mark; Mather, Owen Clifford; Yarnold, Christopher John; Barker, Oliver Robin; Montalbetti, Christian Aldo Georges Napoleon; Hesterkamp, Thomas; Gardiner, Mihaly Daniel
Patent: US2011/118258 A1, 2011 ;
Location in patent: Page/Page column 10 ;