参考文献:
Flentge, Charles A. Chen, Hui-Ju DeGoey, David A. Flosi, William J. Grampovnik, David J. Huang, Peggy P. Kempf, Dale J. Klein, Larry L. Krueger, Allan C. Madigan, Darold L. Randolph, John T. Sun, Minghua Yeung, Ming C. Zhao, Chen Patent: US0/87 A, 0 Location in patent: Page/Page column 04 US 000087 A