1. M. Abdel-Wahab, V. Bechtold, J. Bialy, L. Friedrick, F. Schmidt, Contributed Paper to the Ninth International Conference on the Few Body Problem, Eugene, Oregon (.1980), Volume I.
2. S. Adhikari and A. Fonseca, ibid.
3. B. Cheng-guang, ibid.
4. J. Cameron, R. Abegg, I. van Heerden, D. Hutcheon, P. Kitching, et al., ibid.
5. A. Casel and W. Sandhas, ibid.