References
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A. O. L. Atkin and J. Lehner, Hecke operators on
$\Gamma_0$ (m), Math. Ann. 185 (1970), 134-160. https://doi.org/10.1007/BF01359701 - B. J. Birch and W. Kuyk (Eds.), Modular functions of one variable, IV, Lecture Notes in Math. 476, Springer-Verlag, Berlin, 1975.
- http://modular.math.washington.edu/Tables/tables.html