1. Contribution to design and scale up of packed columns;Billet;Fat Science and Technology,1990
2. Modelling of pressure drop in packed columns;Billet;Chemical Engineering and Technology,1991
3. Relation between pressure drop and mass-transfer in two-phase countercurrent-flow columns;Billet;Fat Science and Technology,1992
4. Predicting mass transfer in packed columns;Billet;Chemical Engineering and Technology,1993
5. Influence of phase ratio on packing efficiency in columns for mass transfer processes;Billet;Chinese Journal of Chemical of Engineering,1995