|   [1] Ablowitz M J, Segur H. Solitons and the Inverse Scattering Transform. Philadelphia, PA: SIAM, 1981: 
1–84 
 
[2] Faddeev L D, Takhtajan L A. Hamiltonian Methods in the Theory of Solitons. Berlin: Springer, 1987: 
356–407 
 
[3] Arnold V I, Givental A B. Dynamical Systems IV. Berlin: Springer, 1990: 161–189 
 
[4] Ablowitz M J, Clarkson P A. Solitons, Nonlinear Evolution Equations and Inverse Scattering. Cambridge: 
Cambridge University Press, 1991: 105–123 
 
[5] Novikov S P, Manakov S V, Pitaevskii L P, Zakharov V E. Theory of Solitons, the Inverse Scattering 
Methods. New York: Consultants Bureau, 1984: 85–195 
 
[6] Hirota R. The Direct Method in Soliton Theory. Cambridge: Cambridge University Press, 2004: 1–109 
 
[7] Matveev V B, Shalle M A. Darboux Transformation and Solitons. Berlin: Springer, 1991: 97–208 
 
[8] Gu C H, Hu H S, Zhou Z X. Darboux Transformation in Soliton Theory and Its Geometric Applications. 
Shanghai: Science and Technology Press, 1999: 76–97 
 
[9] Geng X G. Darboux transformation of the discrete Ablowitz-Ladik eigenvalue problem. Acta Math Sci, 
1989, 9(1): 21–26 
 
[10] Geng X G, Tam H W. Darboux transformation and solitons for generalized nonlinear Schodinger equations. 
J Phys Soc Japn, 1999, 68(5): 1508–1512 
 
[11] Geng X G, Dai H H. A hierarchy of new nonlinear di?erential-di?erence equations. J Phys Soc Japn, 2006, 
75: 013002  |