On the four-dimensional formulation of dimensionally regulated amplitudes A. R. Fazio, P. Mastrolia, E. Mirabella and W. J. Torres Bobadilla Eur. Phys. J. C, 74 12 (2014) 3197 Published online: 18 December 2014 DOI: 10.1140/epjc/s10052-014-3197-4