Direct reconstruction of pp elastic scattering amplitudes from experimental data between 0.83 and 2.7 GeV C.D. Lac, J. Ball, J. Bystricky, J. Derégel, F. Lehar, A. de Lesquen, L. van Rossum, J.M. Fontaine, F. Perrot and P. Winternitz J. Phys. France, 51 23 (1990) 2689-2716 DOI: 10.1051/jphys:0199000510230268900