1. Packer KJ. Diffusion and flow in fluids, in: John Wiley and Sons, editors. Encyclopædia of NMR, Chichester UK 1996; p. 1615–26.
2. Packer KJ. Oil reservoir rocks examined by MRI, in: John Wiley and Sons, editors. Encyclopædia of NMR, Chichester UK 1996; p. 3365–76.
3. Collins RE. Flow of fluids through porous materials, Reinhold publishing corporation, New York, 1961. See in particular pages 17 and 18.
4. In the case of an ideal gas, viscosity is actually independent of density. See for example Glasstone S. and Lewis D. Elements of physical chemistry, London, MacMillan & Co. Ltd 1960.
5. Principles of Nuclear Magnetic Resonance Microscopy;Callaghan,1991