参考文献

Mogi, Muneto; Yamada, Ken; Yasoshima, Kayo; Kawanami, Toshio; Umemura, Ichiro; Iwaki, Yuki; Qin, Hongbo; Imase, Hidetomo Patent: US2009/118287 A1, 2009 ; Location in patent: Page/Page column 71 ;