“Preface.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. ix-xii, www.jstor.org/stable/10.4169/j.ctt6wpwnz.2. Accessed 2 June 2020.
Alsina, C., & Nelsen, R. (2010). Preface. In Charming Proofs: A Journey into Elegant Mathematics (pp. Ix-Xii). Mathematical Association of America. Retrieved June 2, 2020, from www.jstor.org/stable/10.4169/j.ctt6wpwnz.2
Alsina, Claudi, and Roger B. Nelsen. "Preface." In Charming Proofs: A Journey into Elegant Mathematics, Ix-Xii. Mathematical Association of America, 2010. Accessed June 2, 2020. www.jstor.org/stable/10.4169/j.ctt6wpwnz.2.
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