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'''Other sites'''
'''Other sites'''
* [http://www.proofwiki.org/wiki/Definition:Logical_Graph Logical Graph], [http://www.proofwiki.org/ ProofWiki]
* [http://proofwiki.org/wiki/Definition:Logical_Graph Logical Graph], [http://proofwiki.org/ ProofWiki]
* [http://beta.wikiversity.org/wiki/Logical_graph Logical Graph], [http://beta.wikiversity.org/ Wikiversity Beta]
* [http://beta.wikiversity.org/wiki/Logical_graph Logical Graph], [http://beta.wikiversity.org/ Wikiversity Beta]