We characterize the space of the so-called planar mixed automorphic forms of
type $(\nu,\mu)$ with respect to an equivariant pair $(\rho,\tau)$ as the
image, by an appropriate transform, of the usual (Landau) automorphic forms
involving special multiplier.Comment: The main result is in fact contained in a previous paper
  (arXiv.org:0708.3357). The actual version is written without the use the
  spectral theory of the differential operator involved in such paper

Ghanmi, Allal