Slowly moving matter-wave gap soliton propagation in weak random optical lattices M. R. Zhang, X. Y. Jiang, Y. L. Zhang, L. Shi, J. Zi and J. Y. Zhou Eur. Phys. J. B, 58 3 (2007) 269-278 Published online: 08 September 2007 DOI: 10.1140/epjb/e2007-00230-4