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2. Görtler, H. 1955 Tables of universal functions of the new series. Math. Inst., Univ. Freiburg.
3. Goldstein, S. 1960 Lectures on Fluid Mechanics .New York:Interscience.
4. Van Dyke, M. 1962b J. Fluid Mech. 14,481.
5. Hartree, D. R. 1937 Proc. Camb. Phil. Soc. 33,223.