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GarethAd (talk) 14:52, 8 January 2022 (UTC): I removed the references to mathematical.com, which had become dead links. They can still be found in the Wayback Machine, but I had a look at them, and the dates given are impossible. The source is clearly mixing up different people called Theobald. The reference to Freeman's book is good and current, but the date of publication was wrong.[reply]
