参考文献:
Aicher, Thomas Daniel Anzeveno, Peter Biagio Li, Renhua Krasutsky, Alexei Pavlovych Mabry, Thomas Edward Saeed, Ashraf Snyder, Nancy June Stephenson, Gregory Alan Tian, Hongqi Wallace, Owen Brendan Winneroski, JR., Leonard Larry Xu, Yanping Patent: US009/111800 A1, 009 Location in patent: Page/Page column 40 US 0090111800 A1