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Smith, Leonard A. and Spiegel, E. A. (1987) Strange accumulators. Annals of the New York Academy of Sciences, 497 (Chaoti). pp. 61-65. ISSN 0077-8923
Stock, Paul (2014) Ships, clocks and stars: the quest for longitude. Criticks: the reviews website of British Society for Eighteenth-Century Studies (21 Aug 2014) Website.