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Van Brummelen, G. (2017-04-04). Areas, Angles, and Polyhedra. In Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry. : Princeton University Press. Retrieved 6 Apr. 2020, from https://www.universitypressscholarship.com/view/10.23943/princeton/9780691175997.001.0001/upso-9780691175997-chapter-007.