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WikiPedia: Kali_oxide http://chemapps.stolaf.edu/jmol/jmol.php?model=O(%... http://www.nlm.nih.gov/cgi/mesh/2007/MB_cgi?mode=&... http://webbook.nist.gov http://webbook.nist.gov/cgi/cbook.cgi?ID=12136457&... http://www.commonchemistry.org/ChemicalDetail.aspx... http://chemister.ru http://chemister.ru/Database/properties-en.php?dbi... https://archive.org/details/dli.ernet.474939 https://archive.org/details/dli.ernet.474939/page/...