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2. “A New Method to Predict Holdup and Pressure Drop in Packed Columns”;Bemer;Trans. Inst. Chem. Eng.,1978
3. Blok, J. R., “Pulsing Flow in Trickle Bed Columns”, Ph.D. Thesis, University of Groningen (1981).
4. “Hydrodynamic Properties of Pulses in Two-Phase Downflow Operated Packed Columns”;Blok;Chem. Eng. J,1982
5. Blok, J. R. and A. A. H. Drinkenburg, Proc. ISCRE 7, Boston, U.S.A. (1982b).