参考文献

Li, Song; Zhao, Guoming; Xia, Guangqiang; Wang, Lili; Zheng, Zhibing; Xie, Yunde; Zhong, Wu; Xiao, Junhai; Li, Xingzhou; Cui, Hao Patent: US2010/87448 A1, 2010 ; Location in patent: Page/Page column 21 ;