1. L.S. Rodberg and R.M. Thaler, Introduction to The Quantum Theory of Scattering (Academic, New York, 1967) Chapt. 12;
2. M.L. Goldberger and K.M. Watson, Collision Theory (Wiley, New York, 1964) Chapt. 11
3. J.M. Eisenberg and D.S. Koltun, Theory of Meson Interactions with Nuclei (Wiley, New York, 1980) Chapts. 4,5
4. 1. C.J. Batty, Proceedings of the International School of Physics with Low Energy Antiprotons (Erice, 1988)
5. 2. Proceedings of the Workshop on Hadron Facilities and Antiproton Physics (Turino, 1989) [p-atoms]