1. B. J. Ennis, W. Witt, R. Weinekoter, D. Sphar, E. Gommeran, R.H. Snow, T. Allen, G.J. Raymus, & J. D. Litster, Solid-Solid Operations and Processing, in: D. W. Green & R. H. Perry, (Eds.), Perry's Chemical Engineers’ Handbook, 8 edn, McGraw-Hill Professional, New York, 2007.
2. International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use, Quality Risk Management, Q9, adopted by the FDA, Federal Register, 71 (2006) 32105-6.
3. International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use, Pharmaceutical Quality System, Q10, adopted by the FDA, Federal Register, 74 (2009) 15990-1.
4. International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use, Pharmaceutical Development Q8(R1), adopted by the FDA, Federal Register, 74 (2009) 27325-6.
5. R. Freeman, Measuring the flow properties of consolidated, conditioned and aerated powders - A comparative study using a powder rheometer and a rotational shear cell, Powder Technology, 174 (2007) 25-33.