1. G.P. Kivshar, Y. Agrawal. Optical Solitons: From Fibers to Photonic Crystals (Academic Press, New York, 2003)
2. S. Pitaevski, L.P. Stringari. Bose-Einstein Condensation (Oxford University Press, Oxford, 2003)
3. H.-H. Chen, C.-S. Liu, . Phys. Rev. Lett. 37, 693 (1976)
4. A.R. Osborne, E. Segre, G. Boffetta, L. Cavaleri, . Phys. Rev. Lett. 67, 592 (1991)
5. W. Trillo, S. Torruellas (eds.), Spatial Solitons (Springer, Berlin, 2001)