1. H. Schlichting, Boundary-Layer Theory 6th ed. (McGraw-Hill, New York, 1968).
2. G. Birkhoff, Hydrodynamics: A Study in Logic, Fact and Similitude, 2nd ed. (Princeton University Press, Princeton, NJ, 1960).
3. N. N. Lebedev, Special Functions and their Applications (reprinted by Dover, New York, 1972).
4. G. W. Bluman and J. D. Cole, Similarity Methods for Differential Equations (Springer-Verlag, Berlin, 1974).
5. W. F. Ames, Nonlinear Partial Differential Equations in Engineering, Vols. I and II (Academic Press, New York, 1965 and 1972).