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: US9/3689 A, 9 Location in patent: Page/Page column 9