参考文献

Yen, Chi-Feng; Hu, Cheng-Kung; Chou, Ming-Chen; Tseng, Chen-Tso; Wu, Chien-Huang; Huang, Ying-Huey; Chen, Shu-Jen; King, Chi-Hsin Richard Patent: US2006/281712 A1, 2006 ; Location in patent: Page/Page column 105-106 ; US 20060281712 A1