参考文献

Venkatesan, Aranapakam Mudumbai; Santos, Osvaldo Dos; Asselin, Magda; Grosu, George Theodore; Evrard, Deborah A.; Mewshaw, Richard Eric; Meagher, Kristin Patent: US2009/54454 A1, 2009 ; Location in patent: Page/Page column 16 ; US 20090054454 A1