@article{IM_1989__98_1_143730,
     author = {N.J. Wildberger},
     title = {Convexity and unitary represenattions of nilpotent {Lie} groups.},
     journal = {Inventiones mathematicae},
     pages = {281--292},
     publisher = {mathdoc},
     volume = {98},
     number = {1},
     year = {1989},
     zbl = {0684.22005},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__98_1_143730/}
}