1. L. D. Faddeev, in Three-Body Problem in Nuclear and Particle Physics, ed. J.S.C. McKee and P. M. Rolph (North-Holland, 1970).
2. E. O. Alt, P. Grassberger, and W. Sandhas, in Few Particle Problems in the the Nuclear Interaction, ed. I. Slaus et al. (North-Holland, 1972), p. 299.
3. See also the contributions of V. V. Komarov, p. 551 and V. R. Kharchenko, p. 663.
4. D. J. Kouri and F. S. Levin, in Few Body Problems in Nuclear and Particle Physics, ed. R. J. Slobodrian, et al. (Quebec, 1975), pp. 47, 501.
5. W. Sandhas, in Few Body Dynamics, ed. A. N. Mitra et al. (North-Holland, 1976), p. 540. See also the report by Y. E. Kim, ibid., p. 558.