1. Karamzin, Yu.F. and Sukhorukov, A.P., Pis’ma Zh. Eksp. Teor. Fiz., 1974, vol. 20, no. 8, p. 734.
2. Kivshar, Y.S. and Agrawal, G., Optical Solitons: From Fibers to Photonic Crystals, New York: Academic, 2003.
3. Manassah, J.T., Opt. Lett., 1992, vol. 17, p. 1259.
4. Skryabin, D.V. and Firth, W.J., Opt. Commun., 1998, vol. 148, p. 79.
5. Malomed, B.A., Drummond, P., He, H., et al., Phys. Rev. E, 1997, vol. 56, p. 4725.