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* [http://www.science.co.il/PTelements.asp?s=Density List of Periodic Table Elements Sorted by Density] {{en sprog}}
* [http://www.moerchscan.dk/tekspec.htm Lava Pimpsten] {{dødt link}} {{en sprog}}
* [http://www.cet.sunderland.ac.uk/webedit/allweb/news/Philosophy_of_Science/PIRT2002/londres2002-2.doc COLLAPSING STARS (doc)]
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