参考文献

Liu, Gang; Sham, Hing L.; Szczepankiewicz, Bruce G.; Xin, Zhili; Zhao, Hongyu; Serby, Michael D.; Liu, Bo; Liu, Mei Patent: US2006/173050 A1, 2006 ; Location in patent: Page/Page column 34; 60 ; US 20060173050 A1