1. Amano, K., Kato, G., Kitada, A., Takahashi, K., & Harada, H. (1974). Manifold problems on the study tour in a high school (studies on extracurricular activities) (general researches). Bulletin of Nagoya University School of Education Affiliated Upper and Lower Secondary School,
19, 16–21. (In Japanese).
2. Djuknic, G. M., & Richton, R. E. (2001). Geolocation and assisted GPS. Computer,
34(3), 123–125.
3. Dong, Y., Niimura, M., Kunimune, H., & Fuwa, Y. (2010). AS-5-6 Development of safety confirmation system for elderly person using a wireless Ad-hoc network. In Proceedings of the IEICE General Conference, 2010 (pp. S63–S64).
4. Educational Tour Institute. (2013). Practice criteria of school trips.
http://shugakuryoko.com/chosa/kijun/index.html
. Accessed 29 Sep 2013. (In Japanese).
5. Hung, G. T., (2003). The information flow and the problems of the information flow in disasters—the examples of Hanshin earthquake and Taiwan 921 earthquake. Departmental bulletin paper of Osaka University Human Science (Vol. 24, pp. 215–231). (In Japanese).