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3. A note on the solution of transient dispersion problems;Gill,1967
4. Exact analysis of unsteady convection diffusion;Gill,1970
5. W. N. Gill, Ülkü Güceri and R. J. Nunge, Laminar dispersion in diverging channels and concentric annuli, Research and Development Report 443, Office of Saline Water, U.S. Department of Interior.