The irreducible unitary GL ( n - 1 , ℝ ) -spherical representations of SL ( n , ℝ ) G. Van Dijk; M. Poel — 1990 Compositio Mathematica
The Plancherel formula for the pseudo-riemannian space SL ( n , ℝ ) / GL ( n - 1 , ℝ ) G. Van Dijk; M. Poel — 1986 Compositio Mathematica