參考文獻:
Raeppel, Stephane Claridge, Stephen William Saavedra, Oscar Mario Vaisburg, Arkadii Deziel, Robert Zhan, Lijie Mannion, Michael Gaudette, Frederic Zhou, Nancy Z. Isakovic, Ljubomir Patent: US2008/4273 A1, 2008 Location in patent: Page/Page column 66 US 20080004273 A1