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2. Latzko, H., Z. f. angew. Math. Mech. 1 (1921) 268, translated into English in N.A.C.A. Technical Memoranda No. 1068, 1944.
3. Eagle, A. and R. M. Ferguson, Proc. Inst. Mech. Engrs. 2 (1930) 985.
4. Boelter, L. M. K., G. Young and H. W. Iversen, Distribution of heat Transfer Rate in the Entrance Section of a Circular Tube, N.A.C.A. Technical Note No. 1451, July 1948.
5. Davies, V. C. and M. Al-Arabi, Proc. Inst. Mech. Engrs. 169 (1955) 993.