1. For a review, see Scott, A.C., Chu, F.Y.F., McLaughlin, D.W.: Proc. IEEE61, 1443 (1973)
2. Fogel, M.B., Trullinger, S.E., Bishop, A.R., Krumhansl, J.A.: ?Dynamics of Sine Gordon Solitons in the Presence of Perturbations? Report 2668, Materials Science Center, Cornell University, to be published. Several references on applications of solitons in solid state physics are given in this paper
3. See, for instance, Kaup, D.J.: J. Appl. Math.31, 121 (1976)