1. 1) Sigen Energy Nenkan Henshu Iinkai, Ed. :“2003 / 2004 Sigen Energy Nenkan”, pp.903-905, Tsusan Siryo Shuppankai (2003)
2. 2) Japan Society of Energy and Resources, Ed. : “Energy Shigen Handbook”, p.1155, Ohmsha (1996)
3. 3) Seno, M., M. Takagi, K. Takeda, M. Teramoto and T. Hashimoto : “Bunri Kagaku Handbook”, p.647, Kyoritsushuppan (1993)
4. 4) Horio, M. and S. Mori :“Fluidization Handbook”, pp.57-59, Baifuhkan (1999)
5. Fluidized bed viscosity measurements in reduced gravity