参考文献

Bartkovitz, David Joseph; Chu, Xin-Jie; Ding, Qingjie; Karnachi, Prabha Saba; Liu, Jin-Jun; So, Sung-Sau; Zhang, Jing; Zhang, Zhuming Patent: US2012/46306 A1, 2012 ; Location in patent: Page/Page column 36 ;