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@article{MAN_1973__201_162394, author = {William Casselman}, title = {On {Some} {Results} of {Atkin} and {Lehner.}}, journal = {Mathematische Annalen}, pages = {301--314}, publisher = {mathdoc}, volume = {201}, year = {1973}, zbl = {0239.10015}, url = {http://geodesic.mathdoc.fr/item/MAN_1973__201_162394/} }
William Casselman. On Some Results of Atkin and Lehner.. Mathematische Annalen, Tome 201 (1973), pp. 301-314. http://geodesic.mathdoc.fr/item/MAN_1973__201_162394/