Cosmological implications of a viable non-analytical f(R) model S. Capozziello, N. Carlevaro, M. De Laurentis, M. Lattanzi and G. Montani Eur. Phys. J. Plus, 128 12 (2013) 155 Published online: 16 December 2013 DOI: 10.1140/epjp/i2013-13155-4