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<ref name=weisenberger>{{cite web |last=Weisenberger|first=Drew |url=http://education.jlab.org/qa/mathatom_05.html |title=How many atoms are there in the world? |publisher=Jefferson Lab |accessdate=16 януари 2008|lang=en }}</ref>
<ref name=pidwirnyf>{{cite web |last=Pidwirny|first=Michael |url=http://www.physicalgeography.net/fundamentals/contents.html |title=Fundamentals of Physical Geography |publisher=[[University of British Columbia]] Okanagan |accessdate=16 януари 2008| archiveurl=http://web.archive.org/web/20080121080709/http://www.physicalgeography.net/fundamentals/contents.html| archivedate=21 януари 2008 | deadurl=no|lang=en}}</ref>
<ref name=pnas99_22_13966>{{cite journal |last=Anderson|first=Don L |title=The inner inner core of Earth |journal=Proceedings of the National Academy of Sciences |year=2002|volume=99|issue=22|pages=13966 – 68 |doi=10.1073/pnas.232565899 |pmid=12391308 |pmc=137819|bibcode=2002PNAS...9913966A|lang=en}}</ref>
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