“Proof of the Period Theorem.” Outer Billiards on Kites (AM-171), by Richard Evan Schwartz, Princeton University Press, PRINCETON; OXFORD, 2009, pp. 273–278, www.jstor.org/stable/j.ctt7t77g.32. Accessed 15 Aug. 2020.
Schwartz, R. (2009). Proof of the Period Theorem. In Outer Billiards on Kites (AM-171) (pp. 273-278). PRINCETON; OXFORD: Princeton University Press. Retrieved August 15, 2020, from www.jstor.org/stable/j.ctt7t77g.32
Schwartz, Richard Evan. "Proof of the Period Theorem." In Outer Billiards on Kites (AM-171), 273-78. PRINCETON; OXFORD: Princeton University Press, 2009. Accessed August 15, 2020. www.jstor.org/stable/j.ctt7t77g.32.
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