参考文献:
Raeppel, Stephane Claridge, Stephen William Saavedra, Oscar Mario Vaisburg, Arkadii Deziel, Robert Zhan, Lijie Mannion, Michael Gaudette, Frederic Zhou, Nancy Z. Isakovic, Ljubomir Patent: US008/47 A1, 008 Location in patent: Page/Page column 66 US 00800047 A1