参考文献

Kalla, Rao; Perry, Thao; Elzein, Elfatih; Varkhedkar, Vaibhav; Li, Xiaofen; Ibrahim, Prabha; Palle, Venkata; Xiao, Dengming; Zablocki, Jeff Patent: US2005/261316 A1, 2005 ; US 20050261316 A1