参考文献

CHO, Youn-Joung; WADA, Senji; CHOI, Jung-Sik; LEE, Jin-Seo; SAKURAI, Atsushi; CHO, Kyoo-Chul; YOSHINAKA, Atsuya; SATO, Haruyoshi; UEYAMA., Junji; YOSHINO, Tomoharu; SHIMIZU, Masako Patent: US2012/251724 A1, 2012 ;