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4. K. V. S. Reddy, M. C. Van Wijk, and D. C. T. Pei, “Particle dynamics in solids — gas flow in a vertical pipe,” Can. J. Chem. Eng.,8, No. 3, 490–497 (1969).
5. R. Eichhorn, R. Shanin, and U. Navon, Determination of the Velocity of the Solid Phase in Turbulent Flow of a Gas Suspension in Pipes. Heat and Mass Transfer, Vol. 5 [Russian translation], Énergiya, Moscow-Leningrad (1968), pp. 274–291.