1. Abbot, D.C., 1982a, Ap.3. 263, 723.
2. Abbot, D.C., 1982b, in “Wolf-Rayet Stars: Observations, Physics, Evolution”. eds. C.W.H. de Loore and 3.A. Willis (Reidel) p.185.
3. Arnett, W.D., 1972, Ap.3., 176, 681.
4. Arnett W.D. and Thielemann, 1984, this volume.
5. Audouze, J., Chièze, J.P., and Vangioni-Flam, E., 1980, Astron. Astrophys. 91, 49.