参考文献

Alemparte-Gallardo, Carlos; Barfoot, Christopher; Barros-Aguirre, David; Cacho-Izquierdo, Monica; Fiandor Roman, Jose Maria; Hennessy, Alan Joseph; Pearson, Neil David; Remuinan-Blanco, Modesto Jesus Patent: US2009/306089 A1, 2009 ; Location in patent: Page/Page column 27 ;