R2SM: a package for the analytic computation of the R 2 Rational terms in the Standard Model of the Electroweak interactionsM.V. Garzelli and I. MalamosEur. Phys. J. C, 71 3 (2011) 1605DOI: https://doi.org/10.1140/epjc/s10052-011-1605-6