参考文献

Ueno, Kimihisa; Ogawa, Akira; Ohta, Yoshihisa; Nomoto, Yuji; Takasaki, Kotaro; Kusaka, Hideaki; Yano, Hiroshi; Nakagawa, Chiharu; Nakanishi, Satoshi Patent: US2003/176698 A1, 2003 ;