1. IAU Circ. No. 4316.
2. Burrows,A.S., 1990, in Supernovae, A&A Library, Ed. A.G.Petshek, Springer Verlag, pg. 163.
3. Walborn, N.R., et a1.,1989, Astron. Astrophys.,219,229.
4. Suntzeff,N.B.,Bouchet,1991,in Supernovae, ed. E.Woolsley, Springer Verlag,pg 3.
5. Suntzeff,N.B., et a1.,1992,Ap.J.,384,L33.