1. S. W. Kim, W. Namkung and S. D. Kim, Theories Appl. Chem., Eng., 2, 2339 (1996).
2. D. Kunii and O. Levenspiel, Fluidization engineering, Butterworth-Heinemann, Boston (1991).
3. X. Ma and K. Kato, Powder Technol., 95, 93 (1998).
4. T. Baron, C. L., J Bariens, J. D. Hazlett, M. A. Bergougnou and P. Galtier, Powder Technol., 70, 631 (1992).
5. J. Baeyens, D. Geldart and S. Y. Wu, Powder Technol., 71, 71 (1992).