1. For a recent review, see K.S. Stelle, BPS Branes in Supergravity, hep-th/9803116.
2. J.M. Maldacena, The Large N Limit of Superconformal Field Theories and Supergravity, hep-th/9711200.
3. S. Gubser, I. Klebanov, A. Polyakov, Gauge Theory Correlators from Non-Critical String Theory hep-th/9802109.
4. E. Witten, Anti-deSitter Space and Holography, hep-th/9802150.
5. R. Kallosh, J. Kumar, A. Rajaraman, Special Conformal Symmetry of Worldvolume Actions hep-th/9712073.