参考文献:
Basha, Anwer Bunnelle, William H. Dart, Michael J. Gallagher, Megan E. Ji, Jianguo Li, Tao Pace, Jennifer M. Ryther, Keith B. Tietje, Karin R. Mortell, Kathleen H. Nersesian, Diana L. Schrimpf, Michael R. Patent: US5/116 A1, 5 Location in patent: Page/Page column 34-35