The Restriction of a Representation of GL2(k) to GL2(o). William Casselman — 1973 Mathematische Annalen
The Restriction of Admissible Representations to n. William Casselman; M.Scott Osborne — 1978 Mathematische Annalen
On irreducibility of standard modules for generic representations William Casselman; Freydoon Shahidi — 1998 Annales scientifiques de l'École Normale Supérieure
The n -cohomology of representations with an infinitesimal character William Casselman; M. Scott Osborne — 1975 Compositio Mathematica