Dynamics of bright discrete staggered solitons in photovoltaic photorefractive media A. Maluckov, M. Stepić, D. Kip and Lj. Hadžievski Eur. Phys. J. B, 45 4 (2005) 539-546 Published online: 13 July 2005 DOI: 10.1140/epjb/e2005-00220-6