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@article{AM_2001_153_1_a3, author = {J. Lewis and D. Zagier}, title = {Period functions for {Maass} wave forms. {I}}, journal = {Annals of mathematics}, publisher = {mathdoc}, volume = {153}, number = {1}, year = {2001}, url = {http://geodesic.mathdoc.fr/item/AM_2001_153_1_a3/} }
J. Lewis; D. Zagier. Period functions for Maass wave forms. I. Annals of mathematics, Tome 153 (2001) no. 1. http://geodesic.mathdoc.fr/item/AM_2001_153_1_a3/