1. Ward Smith, A. J., Pressure losses in ducted flows, Butterworths, London, 1971, Ch. 1 and 2.
2. Ward Smith, A. J., Component interactions and their influence on the pressure losses in internal flow systems, to be published.
3. Milne-Thompson, L. M., Theoretical hydrodynamics, Macmillan, London, 4th. ed., 1960.
4. Pearson, K., Tables of the incomplete beta-function, Cambridge Univ. Press, 2nd. ed., 1968.