参考文献

Zhou, Jiacheng; Liu, Pingli; Lin, Qiyan; Metcalf, Brian W.; Meloni, David; Pan, Yongchun; Xia, Michael; Li, Mei; Yue, Tai-Yuen; Rodgers, James D.; Wang, Haisheng Patent: US2010/190981 A1, 2010 ; Location in patent: Page/Page column 73 ; US 20100190981 A1