1. M. F. Atiyah, The Harish-Chandra character, London Math. Soc. Lecture Note Series, Vol. 34, 1979, 176–181.
2. V. Bargmann, Irreducible unitary representations of the Lorentz group. Ann. of Math. (2) 48 (1947), 568–640.
3. Progress in Mathematics;E. Ban van den,2004
4. W. Borho and J. L. Brylinski, Differential operators on homogeneous spaces I, Invent. Math., 69 (1982), 437–476; Part III, ibid. 80 (1985), 1–68.
5. A. Borel, Compact Clifford-Klein forms of symmetric spaces, Topology 2 (1963), 111–122.