参考文献

Ji, Yu-Hua; Mammen, Mathai; Husfeld, Craig; Li, Li; Mu, YongQi; Kushner, Aaron; Stangeland, Eric; Mischki, Trevor; Hughes, Adam; Dunham, Sarah Patent: US2006/281740 A1, 2006 ; Location in patent: Page/Page column 37 ; US 20060281740 A1