, Wikihow, 2020-03-06, Retrieved 2020-11-26 | Washington, DC, USA: Mathematical Association of America |
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Michael Henle, "Modern Geometry: Non-Euclidean, Projective, and Discrete", 2nd edition, , 2001• "Inversion in a Circle" and "Inversion of Lines and Circles | Translated from Postnikov's 1963 Russian book on |
The Secrets of Triangles, Prometheus Books, 2012.
neu bearbeitete und erweiterte Auflage 2007, Korrigierter Nachdruck 2009, , S | "The History of the Solution of the Cubic Equation" |
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Lee Johnson 2020-11-02 , , Sciencing, Retrieved 2020-11-26 | Youschkevitch, chief editor: Boris A |
Martin Celli, "A Proof of the Butterfly Theorem Using the Similarity Factor of the Two Wings", 16, 2016, 337—338 | See in particular the bottom of p |
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Houghton Mifflin, Boston republished facsimile by Dover 1960, 2007 as Advanced Euclidean Geometry |
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