AdS_6 Interpretation of 5d Superconformal Field Theories
  We explore the connection of anti-de-Sitter supergravity in six dimensions, based on the exceptional F(4) superalgebra, and its boundary superconformal singleton theory. The interpretation of these results in terms of a D4-D8 system and its near horizon geometry is suggested. 
S. Ferrara, A. Kehagias, H. Partouche and A. Zaffaroni