Dark energy generated from a (super-) string effective action with higher-order curvature corrections and a dynamical dilatonE. Elizalde, S. Jhingan, S. Nojiri, S.D. Odintsov, M. Sami and I. ThongkoolEur. Phys. J. C, 53 3 (2008) 447-457DOI: https://doi.org/10.1140/epjc/s10052-007-0463-8