1. Grad. Texts Math.;P. J. Olver,1993
2. Appl. Math. Sci.;G. W. Bluman,2002
3. C. S. Gardner, J. M. Greene, M. D. Kruskal, and R. M. Miura, Comm. Pure Appl. Math., 27, 97–133 (1974).
4. C. W. Cao and X. G. Geng, “Classical integrable systems generated through nonlinearization of eigenvalue problems,” in: Nonlinear Physics (C. H. Gu, Y. S. Li, and G. Z. Tu, eds.), Springer, Berlin (1994), pp. 68–78.
5. C. W. Cao, Sci. China Ser. A, 33, 528–536 (1990).