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2. S. K. Morgan and H. F. Brady, in Advances in Cryogenic Engineering, Vol. 7, Plenum Press, New York, (1962), p. 206.
3. D. W. Murphy, in Advances in Cryogenic Engineering, Vol. 10, Plenum Press, New York (1964), p. 353.
4. E. R. G. Eckert and T. W. Jackson, “Analytical Investigation of Flow and Heat Transfer in Coolant Passages of Free Convection Liquid Cooled Turbines,” NASA TN 2207 (1950).