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== Reference ==
{{refspisak|2|refs=
<ref name="gasekatalog">[{{Cite web |url=http://gasekatalog.airliquide.de/sdb/061a__helium.pdf |title=Podaci o heliju] |accessdate=24 Mart 2008 |archiveurl=https://web.archive.org/web/20070927003858/http://gasekatalog.airliquide.de/sdb/061a__helium.pdf |archivedate=27 Septembar 2007 |url-status=dead }}</ref>
<ref name="crc">[http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf Handbook of Chemistry and Physics 81. izd.] {{Webarchive|url=https://web.archive.org/web/20120112012253/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf |date=12 Januar 2012 }}, CRC press, {{ISBN|978-0-8493-0481-1}}</ref>
<ref name="away">Melinda Rose, [http://www.photonics.com/Article.aspx?AID=35225 Photonics Spectra], oktobar 2008.</ref>