1. Solitons, Nonlinear Evolution Equations and Inverse Scatterring;Ablowitz,1991
2. Theory of Nonlinear Lattices;Toda,1989
3. Complete integribility and stochastization of discrete dynamical system;Manakov;Sov. Phys.- JETP,1974
4. Theory of Solitons, The Inverse Scattering Methods;Novikov,1984
5. Solitons, Nonlinear Evolution Equation and Inverse Scattering;Ablowitz,1991