no. 1
The irreducible unitary GL (n-1,ℝ)-spherical representations of SL (n,ℝ)
Compositio Mathematica, Tome 73 (1990) no. 1, pp. 1-30. 
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     title = {The irreducible unitary $\mathrm {GL} (n-1,\mathbb {R})$-spherical representations of $\mathrm {SL} (n, \mathbb {R})$},
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     pages = {1--30},
     publisher = {Kluwer Academic Publishers},
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     url = {http://www.numdam.org/item/CM_1990__73_1_1_0/}
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Van Dijk, G.; Poel, M. The irreducible unitary $\mathrm {GL} (n-1,\mathbb {R})$-spherical representations of $\mathrm {SL} (n, \mathbb {R})$. Compositio Mathematica, Tome 73 (1990) no. 1, pp. 1-30. http://www.numdam.org/item/CM_1990__73_1_1_0/

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