1. S.C. Frautschi: Regge Foles and S-Matrix Theory (W.A. Benjamin Inc., N.Y. 1963)
2. L.D. Faddeev: Mathematical Aspects of the Three-Body Problem (Daniel Davey and Co., Inc., New York 1965)
3. R.D. Amado, M.H. Rubin: Phys. Rev. Lett. 25, 194 (1970).
4. R.D. Amado, D.F. Freeman, M.H. Rubin: Phys. Rev. D4, 1032 (1971)
5. R.T. Cahill: Phys. Rev. C9, 473 (1974)