@article{MAN_1982__260_163675,
     author = {D. Keys},
     title = {Reducibility of {Unramified} {Unitary} {Principal} {Series} {Representations} of {p-Adic} {Groups} and {Class-1} {Representations.}},
     journal = {Mathematische Annalen},
     pages = {397--402},
     year = {1982},
     volume = {260},
     zbl = {0488.22026},
     url = {http://geodesic.mathdoc.fr/item/MAN_1982__260_163675/}
}