Stelselteorie: Verskil tussen weergawes
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* [http://systemsthinkingpress.com/pages/General_Systems_Theory/ Systems Thinking World Wide Portal]
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[[en:Systems theory]]
[[es:Teoría de sistemas]]
[[fr:Analyse systémique]]
[[nl:Systeemtheorie]]
[[pl:Teoria systemów]]
[[zh:系统科学]]
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