参考文献:
Iyengar, Rajesh R. Judd, Andrew S. Zhao, Gang Kym, Philip R. Sham, Hing L. Gu, Yugui Liu, Gang Liu, Mei Zhao, Hongyu Clark, Richard F. Frevert, Ernst U. Cool, Barbara L. Zhang, Tianyuan Keyes, Robert F. Hansen, Todd M. Xin, Zhili Patent: US25/868 A, 25 Location in patent: Page/Page column 6 US 25868 A