A note on simple applications of the Killing Spinor Identities
  We show how the Killing Spinor Identities (KSI) can be used to reduce the number of independent equations of motion that need to be checked explicitly to make sure that a supersymmetric configuration is a classical supergravity solution. We also show how the KSI can be used to compute BPS relations between masses and charges. 
Jorge Bellorin and Tomas Ortin (IFT-UAM/CSIC)