1 statement is about "The Logic System of Concept Graphs with Negation"
[graph3_on_PhD_thesis
     [the PhD_thesis,
          Coverage: FCA_concept_graph_with_negation,
          title: "The Logic System of Concept Graphs with Negation",
          Creator: "Frithjof Dau",
          url: http://www.kvocentral.com/reports/dau.pdf]
](06/05/2024);

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