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Dorman, D.R. Singular moduli, modular polynomials, and the index of the closure of ℤ[j(τ)] in ℚ(j(τ)). Math. Ann. 283, 177–191 (1989). https://doi.org/10.1007/BF01446429
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DOI: https://doi.org/10.1007/BF01446429