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@article{MAN_1990__287_1_164715, author = {Robert J. Zimmer}, title = {Unitary spectum and the fundamental group for actions of semisimple {Lie} groups.}, journal = {Mathematische Annalen}, pages = {697--702}, publisher = {mathdoc}, volume = {287}, number = {1}, year = {1990}, zbl = {0681.22014}, url = {http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164715/} }
Robert J. Zimmer. Unitary spectum and the fundamental group for actions of semisimple Lie groups.. Mathematische Annalen, Tome 287 (1990) no. 1, pp. 697-702. http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164715/