参考文献
Elmore, Steven W.; Cooper, Curt S.; Schultz, Colleen C.; Hutchinson, Douglas K.; Donner, Pamela L.; Green, Brian E.; Anderson, David D.; Xie, Qinghua; Dinges, Jurgen; Lynch, Linda M.; Pratt, John K.
Patent: US2002/49223 A1, 2002 ;
US 20020049223 A1