1. Storage and Flow of Solids, Bulletin No. 123;Jenike,1970
2. Powders and Bulk Solids. Behavior, Characterization, Storage and Flow;Schulze,2008
3. Flow properties of three fuel powders;Chen;Particuology,2012
4. EN ISO 60, Plastics – Determination of Apparent Density of Material That can be Poured from a Special Funnel, European Committee for Standardization, Brussels, 1999.
5. EN 1236, Fertilizers – Determination of Bulk Density, European Committee for Standardization, Brussels, 1995.