Decoupling of self-diffusion and structural relaxation during a   fragile-to-strong crossover in a kinetically constrained lattice gas
  We present an interpolated kinetically constrained lattice gas model which exhibits a transition from fragile to strong supercooled liquid behavior. We find non-monotonic decoupling that is due to this crossover and is seen in experiment. 
Albert C. Pan, Juan P. Garrahan and David Chandler