Elastic Green's Function of Icosahedral Quasicrystals
  The elastic theory of quasicrystals considers, in addition to the normal displacement field, three phason degrees of freedom. We present an approximative solution for the elastic Green's function of icosahedral quasicrystals, assuming that the coupling between the phonons and phasons is small. 
J. Bachteler, H.-R. Trebin