参考文献

Kahraman, Mehmet; Borchardt, Allen J.; Cook, Travis G.; Davis, Robert L.; Gardiner, Elizabeth M.M.; Malecha, James W.; Noble, Stewart A.; Prins, Thomas J. Patent: US2008/21026 A1, 2008 ; Location in patent: Page/Page column 16; 25-26 ; US 20080021026 A1