参考文献

Betschmann, Patrick; Burchat, Andrew; Calderwood, David; Curtin, Michael L.; Davidsen, Steven K.; Davis, Heather M.; Frey, Robin R.; Heyman, Howard R.; Hirst, Gavin; Hrnciar, Peter; Michaelides, Michael; Rafferty, Paul Patent: US2005/20619 A1, 2005 ; Location in patent: Page 17-18 ; US 20050020619 A1