1. Hamilton,J.: Pion-nucleon interactions. In: Burhop,E. (Ed.): High energy physics, Vol. 1. New York: Academic Press 1967.
2. Donnachie,A., Hamilton,J.: Ann. Phys. (N.Y.)31, 410 (1965).
3. Oades,G.C.: Suppl. Nuovo Cimento4, 217 (1966).
4. Donnachie,A., Hamilton,J., Lea,A.T.: Phys. Rev.135, B515 (1964).
5. The dynamics of elementary particles and the pion-nucleon interaction, Course B (Nordita Lecture Notes, 1968).