参考文献:
Feng, Jun Gwaltney, Stephen L. Stafford, Jeffrey A. Zhang, Zhiyuan Brodluahrer, Paul R. Elder, Bruce Isbester, Paul Fornicola, Richard S. Kisanga, Philip B. Mobele, Bingidimi I. Palmer, Grant J. Reeve, Maxwell M. Salsbury, Jonathon S. Ulysse, Luckner Venkatraman, Sripathy Patent: US9/77 A1, 9 Location in patent: Page/Page column US 977 A1