参考文献

Liu, Gang; Zhao, Hongyu; Serby, Michael D.; Liu, Bo; Xin, Zhili; Nelson, Lissa T.J.; Szczepankiewicz, Bruce G.; Sham, Hing L. Patent: US2006/89398 A1, 2006 ; Location in patent: Page/Page column 13 ; US 20060089398 A1