1. Gardner, C.S., Greene, J.M., Kruskal, M.D., Miura, R.M.: Method for Solving the Korteweg-de Vries equation. Phys. Rev. Lett. 19, 1095 (1967).
2. Ablowitz, M.J., Kaup, D.J., Newell, A.C., Segur, H.: The Inverse Scattering transform-Fourier analysis for nonlinear problems. Appl. Math. 53, 249 (1974); hereafter referred to as AKNS.
3. Scott, A.C., Chu, F.Y.F., McLaughlin, D.W.: The soliton: a new concept in applied science. Proc. I.E.E.E. 61, 1443 (1973).
4. Bollough, R.K.: Solitons. In Interaction of Radiation with Condensed Matter. Vol.I, IAEA-SMR-20/51, Vienna (1977)
5. also lectures delivered at the International Advanced study Institute on Nonlinear Equations in Physics and Mathematics, Istanbul, August 1-13, 1977. Proceedings edited by.O.Barut.