1. Pressure drop in vertical tubes in transport of solids by gases;Hariu;Ind. Eng. Chem.,1949
2. Pneumatic Conveyance at High Feed Concentrations (in German);Welschof,1962
3. Vertical pneumatic conveying – an experimental study with particles in the intermediate and turbulent flow regimes;Capes;Can. J. Chem. Eng.,1973
4. A.M. Scott, The influence of particle properties on the pressure drop during the pneumatic transport of granular materials. Fourth International Conference on the Pneumatic Transport of Solids in Pipes (PneumoTransport 4), BHRA, Carmel-by-the-Sea, California, 1978, June 26 to 28: A3 21–35.
5. Pressure drop and average particle velocity for gas/solid flows in a vertical pipe (in German);Krötzsch;Chem. Ing. Tech.,1972