1. Smith, N. D. P., S. E. Orchard and A. J. Rhind-Tutt, J. Oil and Colour Chemists Assoc.44 (1961) 613.
2. Pai, S., Viscous Flow Theory, Vol. 1, p. 120, Van Nostrand, 1956.
3. ibid.Pai, S., Viscous Flow Theory, Vol. 1 Pai, S., Viscous Flow Theory, Vol. 1, p. 130.
4. Roesler, F. C, private communication.
5. Southwell, R. V., Theory of Elasticity, p. 142, Oxford 1941.