參考文獻:
Lee, Chih-Hung Bayburt, Erol K. DiDomenico JR., Stanley Drizin, Irene Gomtsyan, Arthur R. Koenig, John R. Perner, Richard J. Schmidt JR., Robert G. Turner, Sean C. White, Tammie K. Zheng, Guo Zhu Patent: US2004/157849 A1, 2004 US 20040157849 A1