MathSciNet bibliographic data MR58637 10.0X van Wijngaarden, A. On the coefficients of the modular invariant $J(\tau)$$J(\tau)$. Nederl. Akad. Wetensch. Proc. Ser. A. 56 = Indagationes Math. 15, (1953). 389–400. Links to the journal or article are not yet available

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