参考文献

Yamashita, Tohru; Kamata, Makoto; Hirose, Hideki; Murakami, Masataka; Fujimoto, Takuya; Ikeda, Zenichi; Yasuma, Tsuneo; Fujimori, Ikuo; Mizojiri, Ryo; Yukawa, Tomoya Patent: US2011/263562 A1, 2011