  The systems of molecules with a permanent dipole moment have solid phases
with various crystal symmetries. In particular, the solid phases of the
simplest of these systems, the dipolar hard sphere model, have been extensively
studied in the literature. The article presents Monte Carlo simulation results
which, at low temperature, point to the stability of a polarized solid phase of
dipolar hard spheres with the unusual number of eleven nearest neighbors, the
so-called primitive tetragonal packing or tetragonal close packing.
