1. 1) H. Ohno (Ed.), “Ionsei Ekitai”, CMC, Tokyo (2003) (in Japanese) (Reproduced as “Ion Ekitai no Kaihatsu to Tenbou”, CMC, Tokyo (2008)).
2. 2) NTS (Ed.), “Ionsei Ekitai no Kinou Sousei to Ouyou”, NTS, Tokyo (2004) (in Japanese).
3. 3) T. Kitazume, E. Sawada, T. Fuchigami and T. Ito, “Ion Ekitai”, Corona, Tokyo (2005) (in Japanese).
4. 4) H. Ohno (Ed.), “Ion Ekitai II”, CMC, Tokyo (2006) (in Japanese).
5. 5) T. Kitazume and M. Kitazume, “Ion Ekitai no Fushigi”, Kogyo Chosakai, Tokyo (2007) (in Japanese).