Renormalization group equation and scaling solutions for f(R) gravity in exponential parametrization Nobuyoshi Ohta, Roberto Percacci and Gian Paolo Vacca Eur. Phys. J. C, 76 2 (2016) 46 Published online: 27 January 2016 DOI: 10.1140/epjc/s10052-016-3895-1