1. T. Hurth, P. van Nieuwenhuizen, A. Waldron and C. Preitschopf, On a possible new R2 theory of supergravity, hep-th/9702052.
2. Topological extensions of the supersymmetry algebra for extended objects
3. Three lectures on supermembranes;Townsend,1989
4. Three lectures on supersymmetry and extended objects;Townsend,1993
5. P-brane democracy;Townsend,1996