@article{1250517664, author = {Tsutsumi, Hiroyuki}, title = {The Atkin inner product for $\Gamma\_0(N)$}, journal = {J. Math. Kyoto Univ.}, volume = {40}, number = {4}, year = {2000}, pages = { 753-775}, language = {en}, url = {http://dml.mathdoc.fr/item/1250517664} }
Tsutsumi, Hiroyuki. The Atkin inner product for $\Gamma_0(N)$. J. Math. Kyoto Univ., Tome 40 (2000) no. 4, pp. 753-775. http://gdmltest.u-ga.fr/item/1250517664/