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3. J. Yang, Solitons in Field Theory and Nonlinear Analysis (Springer, New York, 2001).
4. Y. S. Kivshar and G. P. Agrawal, Optical Solitons: From Fibers to Photonic Crystals (Academic, San Diego, 2003).
5. L. A. Dickey, Soliton Equation and Hamiltonian Systems (World Scientific, New York, 2005).