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Heli Helios Heli hydride cation Heliactin bilophus Helgoland Helio Courier Heliconius Heliodoxa rubricauda Helix pomatia Heli lỏngTài liệu tham khảo
WikiPedia: Heli http://www.britannica.com/EBchecked/topic/260101 http://www.ingentaconnect.com/content/klu/asys/200... http://www.thespacereview.com/article/536/1 http://aleph.nkp.cz/F/?func=find-c&local_base=aut&... http://adsabs.harvard.edu/abs/2004ApJ...600..544C http://www.lpi.usra.edu/meetings/lpsc2007/pdf/2175... http://fti.neep.wisc.edu/Research/he3_pubs.html http://catalogue.bnf.fr/ark:/12148/cb11978648w http://data.bnf.fr/ark:/12148/cb11978648w http://www-d0.fnal.gov/hardware/cal/lvps_info/engi...