Clusters, phason elasticity, and entropic stabilisation: a theory   perspective
  Personal comments are made about the title subjects, including: the relation of Friedel oscillations to Hume-Rothery stabilisation; how calculations may resolve the random-tiling versus ideal pictures of quasicrystals; and the role of entropies apart from tile-configurational. 
C. L. Henley (Cornell Univ.)