1. Whitham, G. B. 1974 Linear and Nonlinear Waves .Wiley.
2. Batchelor, G. K. 1967 An Introduction to Fluid Dynamics .Cambridge University Press.
3. Escudier, M. P. , Bornstein, J. & Zehnder, N. 1980 Observations and LDA measurements of confined turbulent vortex flow.J. Fluid Mech. 98,49–63.
4. Escudier, M. P. 1979 Estimation of pressure loss in ring-type exit chambers.Trans. A.S.M.E. I, J. Fluids Engng 101,511–516.
5. Kelvin, Lord 1980 Vibrations of a columnar vortex.Phil. Mag. 10 (5),155–168. (Math. and Phys. Papers 4, 152–171.)