參考文獻:
Li, Qun Woods, Keith W. Zhu, Gui-Dong Fischer, John P. Gong, Jianchun Li, Tongmei Gandhi, Virajkumar Thomas, Sheela A. Packard, Garrick K. Song, Xiaohong Abrams, Jason N. Diebold, Robert B. Dinges, Jurgen Hutchins, Charles W. Stoll, Vincent S. Rosenberg, Saul H. Giranda, Vincent L. Patent: US2003/199511 A1, 2003 Location in patent: Page/Page column 21