1. Whitham, G. B. 1957 J. Fluid Mech. 2,145.
2. Chester, W. 1960 Adv. in Appl. Mech. 6,119.
3. Oshima, K. , Sugaya, K. , Yammamoto, M. & Totoki, T. 1965 ISAS, University of Tokyo Rep. no. 393.
4. Stanyukovich, K. P. 1960 Unsteady Motion of Continuous Media (trans.ed. M. Holt ).Pergamon.
5. Hayes, W. D. 1968 J Fluid Mech. 32,305.