> ? [some km#FCA_concept_graph_with_negation] [km#graph3_on_PhD_thesis [the pm#PhD_thesis, dc#Coverage: km#FCA_concept_graph_with_negation, pm#title: "The Logic System of Concept Graphs with Negation", dc#Creator: "Frithjof Dau", pm#url: http://www.kvocentral.com/reports/dau.pdf] ](06/05/2024); //Search time: 0.00024 s, printing time: 0.001 s (according to the Unix function gettimeofday())