Discussion on clusters, phasons, and quasicrystal stabilisation
  This paper summarises a two-hour discussion at the Ninth International Conference on Quasicrystals, including nearly 20 written comments sent afterwards, concerning (i) the meaning [if any] of clusters in quasicrystals; (ii) phason elasticity, and (iii) thermodynamic stabilisation of quasicrystals. 
C. L. Henley (1), M. de Boissieu (2), and W. Steurer (3) ((1) Cornell   U., Ithaca NY USA; (2) ENSEEG, Grenoble, France; (3)...