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WikiPedia: Helium cecair http://hyperphysics.phy-astr.gsu.edu/hbase/lhel.ht... http://safety.seas.harvard.edu/services/helium.htm... http://boojum.hut.fi/research/theory/he3.html http://ltl.tkk.fi/research/theory/helium.html //doi.org/10.1103%2FPhysRevLett.15.773 https://ui.adsabs.harvard.edu/abs/1965PhRvL..15..7...