please can anyone help with this article?Notes on the diffusion-type model for the longitudinal mixing of fluids in flow: O. Levenspiel and W. K. Smith, Chem. Engng Sci.6: 227–233, 1957 and  Levenspiel, O. (1972) Chemical Reaction Engineering. 2nd Ed., Wiley,

New York, N.Y. Many thanks.

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