1. Hulley, B.J. (1970), Chem. Engr., CE410-CE413.
2. Stange, K. (1954), Chem. Engr. Tech., 26, 331.
3. Cordell, R.E. (1969), Automatic Sampling System, US Patent 3 472 079.
4. Kaye, B.H. and Naylor, A.G. (1972), Particle Technol., 47–66. Proc. Seminar, Madras (1971), Indian Institute of Technology.
5. ASTM D451-63(1963): Sieve Analysis of Granular Mineral Surfacing for Asphalt Roofing and Shingles.