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2. R. L. Kramer, Director of Engineering Development, The Procter & Gamble Co., Private Communication.
3. Flow properties of bulk solids;Jenike,1960
4. Heat transfer to granular materials;Brinn;Ind. Engng Chem,1948
5. Heat loss from a round cylinder in transverse flow of a granular medium;Donskov;Teploenergetica,1958