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WikiPedia: Pythagoras http://www.britannica.com/EBchecked/topic/485171 http://aleph.nkp.cz/F/?func=find-c&local_base=aut&... http://www.utm.edu/research/iep/p/pythagor.htm http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://catalogue.bnf.fr/ark:/12148/cb11920816v http://data.bnf.fr/ark:/12148/cb11920816v http://www.idref.fr/027085260 http://id.loc.gov/authorities/names/n80162846 http://d-nb.info/gnd/118597248 http://mathlib.info/index.php?act=danhnhan&id=22&P...