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Clapham, C., & Nicholson, J. (2009). utility. In  (Ed.), The Concise Oxford Dictionary of Mathematics. : Oxford University Press,. Retrieved 17 Feb. 2019, from http://www.oxfordreference.com/view/10.1093/acref/9780199235940.001.0001/acref-9780199235940-e-2939.