“Geometry in Three Dimensions.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. 191–208, www.jstor.org/stable/10.4169/j.ctt6wpwnz.15. Accessed 31 May 2020.
Alsina, C., & Nelsen, R. (2010). Geometry in Three Dimensions. In Charming Proofs: A Journey into Elegant Mathematics (pp. 191-208). Mathematical Association of America. Retrieved May 31, 2020, from www.jstor.org/stable/10.4169/j.ctt6wpwnz.15
Alsina, Claudi, and Roger B. Nelsen. "Geometry in Three Dimensions." In Charming Proofs: A Journey into Elegant Mathematics, 191-208. Mathematical Association of America, 2010. Accessed May 31, 2020. www.jstor.org/stable/10.4169/j.ctt6wpwnz.15.
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