1. S. Ferrara, D.Z. Freedman and P. van Nieuwenhuizen in: Particles and fields '76; Proc. of the APS-DPF Meeting, Brookhaven National Laboratory).
2. S.W. MacDowell and F. Mansouri, Yale preprint.
3. P.K. Townsend, Phys. Rev. D, to be published.
4. D.Z. Freedman and A. Das, to be published;
5. P.K. Townsend, Stony Brook preprint ITP-77-2.