参考文献:
Cano, Ivan Collado Dominianni, Samuel James Etgen, Garret Jay Garcia-Paredes, Cristina Johnston, Richard Duane Letourneau, Michael Edward Mantlo, Nathan Bryan Martinelli, Michael John Mayhugh, Daniel Ray Saeed, Ashraf Thompson, Richard Craig Wang, Xiaodong Coffey, David Scott Schmid, Christopher Randall Vicenzi, Jeffrey Thomas Xu, Yanping Patent: US2004/102500 A1, 2004