References
- LAMB, H. L., 1932, Hydrodynamic,8 (6th ed.). Dover,New York, pp. 625–628.
- LIN, C. C., 1955, Theory of Hydrodynamic Stability. Cambridge University Press, Cambridge, pp. 27–45.
- LOVITT, W. V., 1939, Elementary Theory of Equa-tions. Prentice-Hall,New York, pp. 91–101.