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Heli lỏngTài liệu tham khảo
WikiPedia: Heli_lỏng 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