Razlika između izmjena na stranici "Helij"

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== Reference ==
{{refspisak|2|refs=
<ref name="crc">[http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf Handbook of Chemistry and Physics 81. izd.], CRC press, ISBN 978-08493048110-8493-0481-1</ref>
<ref name="away">Melinda Rose, [http://www.photonics.com/Article.aspx?AID=35225 Photonics Spectra], oktobar 2008.</ref>
<ref name="steve">Connor, Steve (2010). ''[http://www.independent.co.uk/news/science/why-the-world-is-running-out-of-helium-2059357.html Why the world is running out of helium – Science – News]''. The Independent</ref>