1. J. Maldacena, hep-th/9711200; N. Itzhaki, J. Maldacena, J. Sonnenschein, S. Yankielowicz, hep-th/9802042.
2. K. Sfetsos, K. Skenderis, hep-th/9711138; H. Boonstra, B. Peeters, K. Skenderis, Phys. Lett. B 411 (1997) 59, hep-th/9801076; S. Hyun, hep-th/9704005.
3. P. Claus, R. Kallosh, A. van Proeyen, hep-th/9711161; P. Claus, R. Kallosh, J. Kumar, P. Townsend, A. Van Proeyen, hep-th/9801206.
4. S. Ferrara, C. Frønsdal, hep-th/9712239.
5. See, e.g., A Salam, E. Sezgin, Supergravity in Diverse Dimensions, World Scientific, 1989, vols. I/II.