@article{IM_1986__83_143308,
     author = {Jean Ludwig and G. Rosenbaum and J. Samuel},
     title = {The elements of bounded trace in the {C*-algebra} of a nilpotent {Lie} group.},
     journal = {Inventiones mathematicae},
     pages = {167--190},
     publisher = {mathdoc},
     volume = {83},
     year = {1986},
     zbl = {0587.22003},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__83_143308/}
}