Constraints on unified models for dark matter and dark energy using H(z) JúlioC. Fabris, PauloL.C. Oliveira and Hermano Velten Eur. Phys. J. C, 71 10 (2011) 1773 Published online: 26 October 2011 DOI: 10.1140/epjc/s10052-011-1773-4