@article{MAN_1977__225_162917,
     author = {Frederick P. Greenleaf and Lawrence Corwin and Richard Penney},
     title = {A {General} {Character} {Formula} for {Irreducible} {Projections} on {L2} of a {Nilmanifold.}},
     journal = {Mathematische Annalen},
     pages = {21--32},
     publisher = {mathdoc},
     volume = {225},
     year = {1977},
     zbl = {0322.46049},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__225_162917/}
}