Supersymmetric penguin contributions to the decay b -> s gamma with   non-universal squarks masses
  We give explicit expressions for the amplitudes associated with the supersymmetric contributions to the process: b -> s gamma in the context of SUSY extensions of Standard Model with non-universal soft SUSY breaking terms.   From experimental data, we deduce the limits on the squark mass insertions obtained from different contributions (gluinos, neutralinos and charginos). 
M.B. Causse and J. Orloff