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@article{MAN_1995__303_4_165385, author = {Peter Hertling}, title = {Small spanning sets of cusp forms.}, journal = {Mathematische Annalen}, pages = {629--652}, publisher = {mathdoc}, volume = {303}, number = {4}, year = {1995}, zbl = {0834.11020}, url = {http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165385/} }
Peter Hertling. Small spanning sets of cusp forms.. Mathematische Annalen, Tome 303 (1995) no. 4, pp. 629-652. http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165385/