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Roger B. Nelsen (2018) Periodic Continued Fractions Via a Proof Without Words, Mathematics Magazine, 91:5, 364-365, Doi:10.1080/0025570X.2018.1456151RogerB. Nelsen2018Periodic Continued Fractions Via a Proof Without WordsMathematics Magazine915364–365Doi:10.1080/0025570X.2018.1456151Open DOISearch in Google Scholar