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2. V. Ginzburg, Perverse sheaves on a loop group and Langlands duality
3. Representations of Coxeter groups and Hecke algebras;Kazhdan;Invent. Math.,1979
4. Singularities, character formulas and aq;Lusztig;Astérisque,1983
5. Algebraic groups and related topics;Lusztig,1985