The n -cohomology of representations with an infinitesimal character William Casselman, M. Scott Osborne (1975) Compositio Mathematica
The PBW filtration, Demazure modules and toroidal current algebras. Feigin, Evgeny (2008) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
The socle filtration of a Verma module Ronald S. Irving (1988) Annales scientifiques de l'École Normale Supérieure
The supports of simple modules over toroidal algebras. Mazorchuk, Volodymyr (1999) Journal of Lie Theory
Towards the Kazhdan-Lusztig conjecture O. Gabber, A. Joseph (1981) Annales scientifiques de l'École Normale Supérieure
Twisted vertex representations of quantum affine algebras. Naihuan Jing (1990) Inventiones mathematicae