1. Gravity flow of bulk solids;Jenike;Utah Univ. Eng. Exp. Stn. Bull.,1961
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3. Modeling flow of bulks solids;Johanson;Powders Technol.,1972
4. Principles of Powder Mechanics;Brown,1970
5. Some aspects of the property of angle of repose of powders;Train;J. Pharm. Pharmacol.,1958