1. Electric volume conduction in fly ash;Bickelhaupt;JAPCA,1974
2. R.E. Bickelhaupt, A Technique for Predicting Fly Ash Resistivity, EPA-600/7-79-204, 1979.
3. Shuujin no Gijyutu to Souchi, The Association of Powder Process Industry and Engineering, Japan, 1997 (in Japanese).
4. Improvement of pulverized coal combustion technology for power generation;Makino;Denchuken Review,2002
5. T. Sema, Karyoku Hatuden Souron, 2002 (in Japanese).