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Burnett, C.  (2004, September 23). Ketton, Robert of (fl. 1141–1157), astronomer and translator. Oxford Dictionary of National Biography. Retrieved 11 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-23723.