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== Enllaços externs ==
* [http://www.mcdonough.com/writings/promise_nylon.htm The Promise of Nylon 6: A Case Study in Intelligent Product Design by William McDonough & Michael Braungart] {{Webarchive|url=https://web.archive.org/web/20071223012900/http://www.mcdonough.com/writings/promise_nylon.htm |date=2007-12-23 }}
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