1. Schlichting, H., Boundary Layer Theory, 4th ed.McGraw-Hill, New York, 1960, pp.120, 185, 218-221.
2. Robertson, J. M., Hydrodynamics in Theory and Application, Prentice-Hall, Englewood Cliffs, N.J., 1965, pp.284-285.
3. Lamb, H., Hydrodynamics, 6th ed.Dover, New York, 1945, pp.46,130-131.