@article{GDZPPN002321971,
title = {Operators of Finite Rank in Unitary Representations of Exponential Lie Groups.},
journal = {Mathematische Annalen},
volume = {261},
year = {1982},
pages = {371-384},
zbl = {0471.22005},
url = {http://dml.mathdoc.fr/item/GDZPPN002321971}
}
Poguntke, Detlev. Operators of Finite Rank in Unitary Representations of Exponential Lie Groups.. Mathematische Annalen, Tome 261 (1982) pp. 371-384. http://gdmltest.u-ga.fr/item/GDZPPN002321971/