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Erskine, R.  (2008, May 24). Murray [née Clarke], Joan Elisabeth Lowther (1917–1996), cryptanalyst and numismatist. Oxford Dictionary of National Biography. Retrieved 17 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-71791.