参考文献

Pratt, John K.; Betebenner, David A.; Donner, Pamela L.; Green, Brian E.; Kempf, Dale J.; McDaniel, Keith F.; Maring, Clarence J.; Stoll, Vincent S.; Zhang, Rong Patent: US2004/167123 A1, 2004 ; Location in patent: Page/Page column 70 ; US 20040167123 A1