1. Review: calibration of the discrete element method;Coetzee;Powder Technol.,2017
2. Fördertechnik 1: Bauelemente, ihre Konstruktion und Berechnung, 6th Edition;Hoffmann,2001
3. Bulk properties of powders;Carson,1998
4. ISO 4324: Surface active agents; powders and granules; measurement of the angle of repose (1983-12), 1983.
5. EN 12047: Solid fertilizers - Measurement of static angle of repose (1996-11), 1996.