1. Attrition in a pneumatic pipeline;Viswanathan;Int. J. Pipeline,1984
2. Studies on attrition in fluidized beds;Rama Ratnam;Int. J. Power Bulk Solids Technol.,1984
3. R. Pitchumani, Characterization of strength of enzyme granules by repeated impact testing, Master's thesis, Delft University of Technology, Delft, Netherlands, August 1999.
4. Particle Attrition: State of the art Review,1987
5. W.J. Beekman, Improvement of dust behaviour for enzyme granulates. Technical report, Gist Brocades, Delft, Netherlands, 1994.