1. Cussler, E. L., Diffusion: Mass Transfer in Fluid Systems, Cambridge University Press, Cambridge, 1984.
2. Crank, J. and Park, H. S., Diffusion in Polymers, Academic Press, New York, 1968.
3. Crank, J., The Mathematics of Diffusion, Oxford University Press, London, 1975.
4. Guerra, G. and Paolone, C., J. Coatings Tech., 55(701), 53, 1983.
5. Ellis, W. H., J. Coatings Tech., 55(696), 63, 1983.