Special Values for Conformally Invariant Systems Associated to Maximal   Parabolics of Quasi-Heisenberg Type
  In this paper we construct conformally invariant systems of first order and second order differential operators associated to a homogeneous line bundle $\Cal{L}_{s} \to G_0/Q_0$ with $Q_0$ a maximal parabolic subgroup of quasi-Heisenberg type. This generalizes the results by Barchini, Kable, and Zierau.To do so we use techniques different from ones used by them. 
Toshihisa Kubo
math.RT