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Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
'''Typical sites'''
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'''Other sites'''
* [http://www.proofwiki.org/wiki/Definition:Logical_Graph Logical Graph], [http://www.proofwiki.org/ ProofWiki]
* [http://beta.wikiversity.org/wiki/Logical_graph Logical Graph], [http://beta.wikiversity.org/ Wikiversity Beta]
* [http://knol.google.com/k/jon-awbrey/pragmatic-maxim/3fkwvf69kridz/6 Pragmatic Maxim], [http://knol.google.com/ Google Knol]
* [http://vectors.usc.edu/thoughtmesh/publish/141.php Pragmatic Maxim], [http://vectors.usc.edu/thoughtmesh/ ThoughtMesh]
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