Model-independent data reductions of elastic proton–proton scattering D.A. Fagundes, M.J. Menon and G.L.P. Silva Eur. Phys. J. C, 71 5 (2011) 1637 Published online: 14 May 2011 DOI: 10.1140/epjc/s10052-011-1637-y