1. Velzen, D. van, Flamm, H. J. and Langenkamp, H., “Gas Flow Patterns in Spouted Beds”, paper presented at International Symposium on Spouted Beds, Vancouver, September 1973.
2. An analysis of air and solid flow in a spouted wheat bed
3. Velzen, D. van, Flamm, H. J. and Langenkamp, H., “Motion of Solids in Fluidized Bed Coaters”, paper presented at the “Reaktortagung 1973”, Karlsrube (Germany), April 1973.