Discrete series and the unipotent subgroup
Compositio Mathematica, Tome 28 (1974) no. 1, pp. 9-19. 
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Lehrer, G. I. Discrete series and the unipotent subgroup. Compositio Mathematica, Tome 28 (1974) no. 1, pp. 9-19. http://www.numdam.org/item/CM_1974__28_1_9_0/

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