1. [1] http://www.rtri.or.jp/press/pdf/20150903-1.pdf
2. [2] Nagashima, Ken., Seino, Hiroshi., Miyazaki, Yoshiki., Arai, Yuuki., Sakai, Naomichi. and Murakami, Masato., "Loading force density of a superconducting magnetic bearing using superconducting bulk body and superconducting coils," RTRI Report, Vol.21, No.9, pp.29-34, 2007 (in Japanese).
3. [3] http://www.rtri.or.jp/press/2011/20110606.html
4. [4] Hasegawa, Hitoshi., Matsue, Hitoshi., Nagashima, Ken., and Yamashita, Tomohisa., "Development of superconducting flywheel energy storage systems for demonstrations," RTRI Report, Vol.29, No.11, pp.41-46, 2014 (in Japanese).
5. [5] http://www.kubotek.com/info/pdf/news/2015/CFRP_flywheel_nr_150202.pdf