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WikiPedia: Atom_helium http://www.chemspider.com/Chemical-Structure.22423... http://chemapps.stolaf.edu/jmol/jmol.php?model=%5B... http://pubchem.ncbi.nlm.nih.gov/summary/summary.cg... http://www.nlm.nih.gov/cgi/mesh/2007/MB_cgi?mode=&... http://www.kegg.jp/entry/D04420 http://www.whocc.no/atc_ddd_index/?code=V03AN03 http://www.commonchemistry.org/ChemicalDetail.aspx... https://www.ebi.ac.uk/chebi/searchId.do?chebiId=33...