Осемдесетоъгълник (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Осемдесетоъгълник" in Bulgarian language version.

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2books.google.com

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books.google.com

Gorini, Catherine A. The Facts on File Geometry Handbook // Infobase Publishing, 2009. с. 110.
The New Elements of Mathematics: Algebra and Geometry by Charles Sanders Peirce (1976), p. 298

foundalis.com

Greek Numbers and Numerals (Ancient and Modern) by Harry Foundalis

wolfram.com

mathworld.wolfram.com

Constructible Polygon