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WikiPedia: Amilcare Ponchielli http://www.operaitaliana.com/autori/biografia.asp?... http://www.youtube.com/watch?v=W3ILbnHhAzk http://opera.stanford.edu/Ponchielli/ http://philomusica.unipv.it/annate/2004-5/saggi/si... https://web.archive.org/web/20050204114740/http://... https://web.archive.org/web/20070901155245/http://...