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Foot, M., & Burton, A.  (2011, January 06). Marks, Leopold Samuel [Leo] (1920–2001), cryptographer, playwright, and screenwriter. Oxford Dictionary of National Biography. Retrieved 16 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-75253.