1. B. de Wit and J. Louis, “Duality and Supersymmetry”, to appear in the Proceedings of the Trieste Spring School on String Theory, Gauge Theory and Quantum Gravity, 1997.
2. 2. For an overview of results in supersymmetry and supergravity, see, for example, S. Ferrara (ed.), "Supersymmetry", Vol. 1 & 2, North-Holland/World Scientific (1989)
3. 3. A. Salam and E. Sezgin (eds.), "Supergravities in Diverse Dimensions", Vol. 1& 2, North-Holland/World Scientific (1989). There are many references on the structure of super multiplets. A few of them are, W. Nahm, "Supersymmetries and their representations", Nucl. Phys. B135 (1978) 149
4. 4. S. Ferrara, C.A. Savoy and B. Zumino, "General massive multiplets in extended supersymmetry", Phys. Lett. 100B (1981) 393
5. 5. S. Ferrara and C.A. Savoy, "Representations of extended supersymmetry on one-and two-particle states", in Supergravity' 81, eds. S. Ferrara and J.G. Taylor, Cambridge University Press (1982), p 47.