
References
 Wells, David: The Penguin Dictionary of Curious and Interesting GEOMETRY. London,England: Penguin Books, p.67 & 201, 1991.(Out of print)
 Yates,Robert C. : A Handbook on Curves and their Properties. J.W.Edwards,Ann Arbor, p 170 & 206, 1947.
 Lockwood,E.R. : A Book of Curves. Cambridge Univ.,London, p.99, first published in 1961.
 Ogilvy,C.S. : Excursions in Geometry. Dover, p. 13,1990. Originally published by Oxford in 1969.
 Ogilvy,C.S. : Excursions in Mathematics. Dover, p. 83 & 148,1994. Originally published by Oxford in 1956.
 Steinhaus,H.: Mathematical Snapshots. Dover, p. 111, 1999. Originally published by Oxford in 1983.
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