1. The storage and recovery of particulate solids;Richards,1966
2. Flow properties. Powders in Industry;Brown;Monograph,1961
3. The angle of repose of potash pellets;Frydman;Powder Tech.,1974
4. Effect of sphere diameter on the mechanical behaviour of glass spheres;Kouwenhoven;J. agric. Engng Res.,1975
5. Soil Mechanics;Lambe,1969