Orientational Phase Transition in Solid C_60: A Model Approach
  A simple model for the angular dependent interaction between C_60 molecules in face centered cubic lattice is proposed and analyzed by use of the rigorous bifurcation approach. The quantitative results for the orientational phase transition and the characteristics of the ordered phase are in good agreement with the experimental data. 
T.I. Schelkacheva and E.E. Tareyeva