Boomerang: Forskelle mellem versioner
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== Kilder/referencer ==
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* [http://www.boomerang.org.au/articles/article-what-is-a-boomerang.html Boomerang Association of Australia: What is a Boomerang?] {{Webarchive|url=https://web.archive.org/web/20090208042945/http://boomerang.org.au/articles/article-what-is-a-boomerang.html |date= 8. februar 2009 }}
* [http://plus.maths.org/issue7/features/boomerangs/ Unspinning the boomerang by Hugh Hunt] Citat: "... Perhaps surprisingly, it's reported that the earliest known users of boomerangs were found in what is now [[Polen|Poland]], about twenty thousand years ago ([[18. årtusinde f.Kr.|18,000 years BC!]])..."
* [http://www.rediboom.com/englisch/geschich/index.html Boomerang History: How the Throwing Wood and the Boomerang Developed] Citat: "...The use of the throwing wood is verified by rock paintings dating from the [[Yngre stenalder|Neolithic Age]] (since approx. [[5. årtusinde f.Kr.|5000 v.Chr.]])..."
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