Low-energy differential cross sections of pion-proton ( pi +/-p) scattering. I. The isospin-even forward scattering amplitude at T pi =32.2 and 44.6 MeV

Phys Rev C Nucl Phys. 1995 Apr;51(4):2144-2158. doi: 10.1103/physrevc.51.2144.
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