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@article{MAN_1973__206_162525, author = {William Casselman}, title = {The {Restriction} of a {Representation} of {GL2(k)} to {GL2(o).}}, journal = {Mathematische Annalen}, pages = {311--318}, publisher = {mathdoc}, volume = {206}, year = {1973}, zbl = {0253.20062}, url = {http://geodesic.mathdoc.fr/item/MAN_1973__206_162525/} }
William Casselman. The Restriction of a Representation of GL2(k) to GL2(o).. Mathematische Annalen, Tome 206 (1973), pp. 311-318. http://geodesic.mathdoc.fr/item/MAN_1973__206_162525/