曲線
↑ Heath 1908, p. 153.
↑ Heath 1908, p. 160.
1 2 Lockwood 1961, p. ix.
↑ Lockwood 1961, p. 132.
↑ Lockwood 1961, p. 129.
↑ O'Connor, John J.; Robertson, Edmund F., “Spiral of Archimedes”, MacTutor History of Mathematics archive, University of St Andrews, https://mathshistory.st-andrews.ac.uk/Curves/Spiral/ .
↑ “Jordan arc definition at Dictionary.com. Dictionary.com Unabridged. Random House, Inc”. Dictionary.reference.com. 2012年3月14日閲覧。
↑ Osgood, William F. (January 1903). “A Jordan Curve of Positive Area”. Transactions of the American Mathematical Society (American Mathematical Society) 4 (1): 107–112. doi:10.2307/1986455. ISSN 0002-9947. JSTOR 1986455.