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2. W. P. Su, “Nonlinear Excitations in Polyacetylene”, in: these Proceedings (1983); A. R. Bishop, “Solitons in Biological and Synthetic Polymers”, in: these Proceedings (1983).
3. M. Sargent III, M. O. Scully and W. E. Lamb Jr., “Laser Physics”, Addison Wesley Publ. Co., Reading, Mass. (1974).
4. R. K. Bullough, P. J. Caudrey and H. M. Gibbs, “The double sine-Gordon equations: a physically applicable system of equations”, in: “Solitons” Topics in Current Physics 17, R. K. Bullough and P. J. Caudrey, eds., Springer Verlag, Heidelberg (1980). Chap III.
5. R. K. Bullough, P. M. Jack, P. W. Kitchenside and R. Saunders, Physica Scripta 20: 364 (1979).