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MacMahon, M.  (2007, January 04). Ellis [formerly Sharpe], Alexander John (1814–1890), phonetician and mathematician. Oxford Dictionary of National Biography. Retrieved 12 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-8683.