@article{IM_1980__60_142742,
     author = {A.W. Knapp and E.M Stein},
     title = {Intertwining {Operators} for {Semisimple} {Groups,} {II.}},
     journal = {Inventiones mathematicae},
     pages = {9--84},
     publisher = {mathdoc},
     volume = {60},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__60_142742/}
}