1. 3) A. K. LAHIRI and V. SESHADRI : JISI, March (1969), p. 293
2. 7) S. ERGUN : Chem. Eng. Prog., 48 (1952) 2, p. 89
3. 8) J. RADESTOCK and R. JESCHAR : Stahl u. Eisen, 90 (1970) 22, p. 1249
4. 10) V. STANEK and J. SZEKELY : Canad. J. Chem. Eng., 50 (1972), p. 9
5. 13) J. YAGI and J. SZEKELY : Trans. ISIJ, 17 (1977), p. 576