1. G. Kirchhoff,Vorlesungen über Matematische Physik(Teubner, Leipzig, 1883), 3rd ed., Vol. 1, p. 257.
2. G. K. Batchelor,An Introduction to Fluid Dynamics(Cambridge University Press, Cambridge, 1967), Chap. 7.
3. H. Lamb,Hydrodynamics(Dover, New York, 1945), 6th ed., Chap. VIII.
4. A. Sommerfeld,Mechanics of Deformable Bodies(Academic, New York, 1964), Chap. IV.