A Revisit of SO(6) Dynamical Symmetry in Nuclear Structure
  According to the analysis based on the fermion dynamical symmetry model, nuclei previously regarded as SO(6)-like (e.g. $^{128}$Xe and $^{196}$Pt) are shown to be more akin to the transitional nuclei between SO(7) and SO(6) symmetries. 
Xing-Wang Pan and Da Hsuan Feng