Discrete decomposability of the restriction of A ... with respect to reductive subgroups and its applications. Toshiyuki Kobayashi (1994) Inventiones mathematicae
Distributions of Positive Type and Representations of Lie Groups. Johan F. Aarnes (1979) Mathematische Annalen
Duality, imprimitivity, reciprocity Krzysztof Maurin, Lidia Maurin (1975) Annales Polonici Mathematici