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Wilkins, G.  (2004, September 23). Cowell, Philip Herbert (1870–1949), mathematician and astronomer. Oxford Dictionary of National Biography. Retrieved 4 Apr. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-57186.