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Cheng, T. (2009-11-04). The expanding universe and thermal relics. In  (Ed.), Relativity, Gravitation and Cosmology: A Basic Introduction. : Oxford University Press,. Retrieved 19 Feb. 2019, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199573639.001.0001/acprof-9780199573639-chapter-10.