Stelselteorie: Verskil tussen weergawes
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== Eksterne skakels ==
{{Commons-kategorie inlyn|Systems theory}}
* [http://systemsthinkingpress.com/pages/General_Systems_Theory/ Wêreldwye sisteemdenkepoort] {{Webarchive|url=https://web.archive.org/web/20050309032828/http://systemsthinkingpress.com/pages/General_Systems_Theory/ |date= 9 Maart 2005 }}
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