1. An Outline of Statistical Methods;Arkin,1939
2. J. Beddow (Ed.), Particle Characterizaton in Technology, CRC Press, Boca Raton, FL, 1984, 3 vols. Vol II, Chapter 1, 3–15.
3. Mechanics of particulate materials: the principles;Feda,1982
4. Elasticity, Fracture and Flow;Jaeger,1969
5. Shape, surface texture and coatings;Mather,1955