1. Patent of J.E. Swon, G.W. Hill, US 4658631: Friability drum tester for pharmaceutical tablets, 1987.
2. The use of reliable measurements of dustiness of chemicals in selecting the most appropriate dust control technology;Mark,2005
3. Longitudinal mixing of granular material flowing through a rotating cylinder part I. Descriptive and theoretical;Rutger;Chem. Eng. Sci.,1965
4. The modelling of transverse solids motion in rotary kilns;Henein;Metall. Trans. B,1983
5. Passage of solids through rotary kilns;Saeman;Chem. Eng. Prog.,1951