参考文献

Sugawara, Masanobu; Fujii, Akio; Okuro, Kazumi; Saka, Yasuhiro; Nagashima, Nobuo; Inoue, Kenji; Takeda, Toshihiro; Kinoshita, Koichi; Moroshima, Tadashi; Fuse, Yoshihide; Ueda, Yasuyoshi Patent: US2003/32814 A1, 2003 ;