“A conceptual graph is a finite connected bipartite graph which consists of concepts and conceptual relations. Every conceptual relation has one or more arcs, each of which is linked to a concept. We define a multilevel conceptual graph to be a conceptual graph in which some of the concepts and conceptual relations arc sensitive.”

—  John F. Sowa

Source: Conceptual Structures, 1984, p. 73 cited in: National Computer Security Conference Proceedings, 1992. DIANE Publishing Company. p. 320

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John F. Sowa9
artificial intelligence researcher 1940

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