1. Recent results on pion-pion interactions obtained from pion production experiments
2. J. Basdevant and J. Reignier: Pion-Pion Interaction I, II, lecture notes at Ecole Internationale de la Physique des Particules Elémentaires, Herceg-Novi (1970).
3. P. Sonderegger and P. Bonamy: Saclay preprint, contributed paper No. 372 to Lund Conference (1969). See also P. Sonderegger in Proceedings of Third International Conference on High Energy Collisions, Stony Brook (1969).
4. Kinematical constraints on Regge-pole residues
5. Kinematical form factors in the peripheral model