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Pietermaritzburg Pietro Badoglio Pietro Mascagni Piet Mondrian Pietas Pietro Parolin Pieter Bruegel il Vecchio Pietro Locatelli Pieter Zeeman Piet Hein (nhà khoa học)Tài liệu tham khảo
WikiPedia: Piet Hein (nhà khoa học) http://www.pamono.com/designers/piet-hein http://www.piethein.com/ http://www.piethein.com/usr/piethein/HomepagUK.nsf... http://mathworld.wolfram.com/Superellipse.html http://www.fam-bundgaard.dk/SOMA/HISTORY.HTM http://www.fam-bundgaard.dk/SOMA/NEWS/N001203.HTM http://www.archimedes-lab.org/grooks.html https://books.google.com/books?id=lFYEAAAAMBAJ&lpg... https://web.archive.org/web/20050305223250/http://... https://web.archive.org/web/20100804202919/http://...