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Clayden, D. (2005-04-14). How valves work. In Alan Turing's Automatic Computing Engine: The Master Codebreaker's Struggle to build the Modern Computer. : Oxford University Press. Retrieved 22 Jan. 2020, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198565932.001.0001/acprof-9780198565932-chapter-18.