参考文献:
Kuntz, Kevin Uehling, David Edward Waterson, Alex Gregory Emmitte, Kyle Allen Stevens, Kirk Shotwell, John Brad Smith, Stephon Cornell Nailor, Kristen E. Salovich, James M. Wilson, Brian John Cheung, Mui Mook, Robert Anthony Baum, Erich W. Moorthy, Ganesh Patent: US8/34 A, 8 Location in patent: Page/Page column 6 US 834 A