Symmetric Spaces and star representations III. The Poincare Disk
  This article is a contribution to the domain of (convergent) deformation quantization of symmetric spaces by use of Lie groups representation theory. We realize the regular representation of $SL(2,\R)$ on the space of smooth functions on the Poincar\'e disc as a sub-representation of $SL(2,\R)$ in the Weyl-Moyal star product algebra on $\R^2$. We indicate how it is possible to extend our construction to the general case of a Hermitian symmetric space of tube type. 
P.Bieliavsky, M.Pevzner