1. U.S. Pharmacopeia XXIII, 1995. U.S. Pharmacopeial convention. Rockville, M.D. pp. 2313.
2. An assessment of dry blending equipment;Adams;Trans. Inst. Chem. Eng,1956
3. Pattern-formation in flowing sand;Baxter;Phys. Rev. Lett.,1989
4. Fundamental powder mixing mechanisms;Bridgwater;Powder Technol.,1976
5. Callaghan, P.T., 1991. Principles of Nuclear Magnetic Resonance Microscopy, Oxford.