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WikiPedia: Niken(II)_oxit http://www.chemspider.com/Chemical-Structure.14121... http://www.webmineral.com/data/Bunsenite.shtml http://chemapps.stolaf.edu/jmol/jmol.php?model=O%3... http://pubchem.ncbi.nlm.nih.gov/summary/summary.cg... http://ecb.jrc.it/esis/index.php?GENRE=ECNO&ENTREE... http://www.commonchemistry.org/ChemicalDetail.aspx... http://www.mindat.org/min-801.html https://monographs.iarc.fr/ENG/Monographs/vol100C/... https://www.unece.org/fileadmin/DAM/trans/danger/p...