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* [http://mywikibiz.com/Minimal_negation_operator Minimal Negation Operator], [http://mywikibiz.com/ MyWikiBiz]
* [http://mywikibiz.com/Minimal_negation_operator Minimal Negation Operator], [http://mywikibiz.com/ MyWikiBiz]
* [http://planetmath.org/encyclopedia/MinimalNegationOperator.html Minimal Negation Operator], [http://planetmath.org/ PlanetMath]
* [http://planetmath.org/MinimalNegationOperator Minimal Negation Operator], [http://planetmath.org/ PlanetMath]
* [http://proofwiki.org/wiki/Definition:Minimal_Negation_Operator Minimal Negation Operator], [http://proofwiki.org/ ProofWiki]
* [http://proofwiki.org/wiki/Definition:Minimal_Negation_Operator Minimal Negation Operator], [http://proofwiki.org/ ProofWiki]
* [http://beta.wikiversity.org/wiki/Minimal_negation_operator Minimal Negation Operator], [http://beta.wikiversity.org/ Wikiversity Beta]
* [http://beta.wikiversity.org/wiki/Minimal_negation_operator Minimal Negation Operator], [http://beta.wikiversity.org/ Wikiversity Beta]