Emergence of running dark energy from polynomial f(R) theory in Palatini formalism Marek Szydłowski, Aleksander Stachowski and Andrzej Borowiec Eur. Phys. J. C, 77 9 (2017) 603 Published online: 12 September 2017 DOI: 10.1140/epjc/s10052-017-5181-2