1. Arthur, J.: Unipotent automorphic representations: conjectures, Astérisque (1989), no. 171-172, 13–71, Orbites unipotentes et représentations, II
2. Arthur, J.: On elliptic tempered characters. Acta Math. 171(1), 73–138 (1993)
3. Arthur, J.: The endoscopic classification of representations, American Mathematical Society Colloquium Publications, vol. 61, American Mathematical Society, Providence, RI, Orthogonal and symplectic groups (2013)
4. Ban, D., Goldberg, D.: $$R$$-groups and parameters. Pac. J. Math. 255(2), 281–303 (2012)
5. Ban, D., Goldberg, D.: $$R$$-groups, elliptic representations, and parameters for GSpin groups. Forum Math. 27(6), 3301–3334 (2015)