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Author co-citation network. Each node in the graph represents a cited author, and the size of the node reflects the frequency of citations for that author. The thickness of the links between nodes is proportional to the strength of co-citation between the 2 authors represented by the nodes. Nodes with a betweenness centrality greater than or equal to 0.1 are identified by a purple circle. The color depth of each node indicates the temporal order of the author’s publication.
