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, Figure 2. Buchanan and Tullock co-authorship sub-network

, Size of vertex (author) is proportional to its unweighted average score in degree, betweenness, Laplacian centrality, and clustering. Vertex color shade indicates which sub-network it belongs to Buchanan's non-common co-authors (blank), Buchanan and Tullock's common co-authors (light), and Tullock's non-common co-authors (dark), Number on vertex refers to the corresponding author's PhD adviser: 1 (Buchanan), vol.2

, Buchanan and Tullock's co-authorships with their Ph.D. "children and grandchildren" Note: Co-authorship links in the whole 1621-node network between PhD dissertation advisers (Buchanan, Tullock, Holcombe, and Tollison) and their ex-PhD students