%0 Journal Article %A Corrado Marastoni %T Generalized Verma modules, b-functions of semi-invariants and duality for twisted $ \mathcal{D}$-modules on generalized flag manifolds %J Comptes Rendus. Mathématique %D 2002 %P 111-116 %V 335 %N 2 %I Elsevier %R 10.1016/S1631-073X(02)02449-4 %G en %F CRMATH_2002__335_2_111_0