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Aryabhata, Inventor of the Digit Zero - Timeline Index http://www.timelineindex.com/content/view/1452 1981JRASC..75...29B Page 1:29 http://articles.adsabs.harvard.edu//full/seri/JRASC/0075//0000029.000.html On the Heavens, by Aristotle http://etext.library.adelaide.edu.au/a/aristotle/heavens DNB, Katalog der Deutschen Nationalbibliothek http://d-nb.info/gnd/4131692-7 Nicolaus Copernicus Gesamtausgabe
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