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4. Arthur, J.: The Endoscopic Classification of Representations. American Mathematical Society Colloquium Publications, vol. 61. American Mathematical Society, Providence (2013); Orthogonal and symplectic groups
5. Badulescu, A.I.: Global Jacquet–Langlands correspondence, multiplicity one and classification of automorphic representations. Invent. Math. 172(2), 383–438 (2008); With an appendix by Neven Grbac