Superspace Representations of SU(2,2/N) Superalgebras and Multiplet   Shortening
  We derive massless and massive representations of all SU(2,2/N) superalgebras by using superfields defined in "harmonic superspace". This method allows one to easily construct "short superfields" which are relevant in the analysis of the AdS/CFT correspondence. 
S. Ferrara (CERN, TH Division)