NMSSM Higgs Detection: LHC, LC, $\gam C$ Collider Complementarity and   Higgs-to-Higgs Decays
  We discuss the importance of being able to detect Higgs-to-Higgs-pair decays in the context of the Next-to-Minimal Supersymmetric Model (NMSSM) and demonstrate the excellent capabilities of a photon collider for this purpose. 
John F. Gunion (U.C. Davis) and Michal Szleper (Northwestern U.)