* Some content adapted fom the [http://www.getwiki.net/ GetWiki] article [http://www.getwiki.net/-Cybernetics&oldid=1536 "Cybernetics"] under the [[GNU Free Documentation License]].
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* Some content adapted from the [http://www.getwiki.net/ GetWiki] article [http://www.getwiki.net/-Cybernetics&oldid=1536 "Cybernetics"] under the [[GNU Free Documentation License]].