参考文献

Kobashi, Seiichi; Uda, Junichiro; Miyata, Sachiho; Inoue, Tsutomu; Ashizawa, Naoki; Matsumoto, Koji; Taniguchi, Tetsuya; Iwanaga, Takashi; Nagata, Osamu Patent: US2012/184587 A1, 2012 ; Location in patent: Page/Page column 13 ;