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Hirschhorn, M.D. A Simple Proof that ζ(2) = \(\frac{\pi^{2}}{6}\) . Math Intelligencer 33, 81–82 (2011). https://doi.org/10.1007/s00283-011-9217-4
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DOI: https://doi.org/10.1007/s00283-011-9217-4