@article{MAN_1993__296_4_165115,
     author = {W. Casselman},
     title = {Extended automorphic forms on the upper half plane.},
     journal = {Mathematische Annalen},
     pages = {755--762},
     publisher = {mathdoc},
     volume = {296},
     number = {4},
     year = {1993},
     zbl = {0786.11025},
     url = {http://geodesic.mathdoc.fr/item/MAN_1993__296_4_165115/}
}