@article{GDZPPN00210685X, title = {Convexity and unitary represenattions of nilpotent Lie groups.}, journal = {Inventiones mathematicae}, volume = {96}, year = {1989}, pages = {281-292}, zbl = {0684.22005}, url = {http://dml.mathdoc.fr/item/GDZPPN00210685X} }
Wildberger, N.J. Convexity and unitary represenattions of nilpotent Lie groups.. Inventiones mathematicae, Tome 96 (1989) pp. 281-292. http://gdmltest.u-ga.fr/item/GDZPPN00210685X/