1. Comparison of absorptive one pion exchange model with measurements of π−p → π+π−n
2. Questions in ππ scattering and related processes;Morgan;Rutherford High Energy Laboratory preprint RPP/T/27,1972
3. G. Grayer, B. Hyams, C. Jones, P. Schlein and P. Weilhammer, W. Blum, H. Dietl, W. Koch, E. Lorenz, G. Lütjens, W. Männer, J. Meissburger, W. Ochs and U. Stierlin, High statistics study of the reaction π−p → π+π−n, apparatus, method of analysis, and general features of results at 17 GeV/c, to be published.