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References:
[1] G. Chartrand, K. Novotny, and S.J. Winters: The ultracenter and central fringe of a graph. Networks (to appear). MR 1844442
[2] G. Chartrand, G.L. Johns, and S. Tian: Directed distance in digraphs: centers and peripheries. Congr. Numer. 89 (1992), 89–95. MR 1208943
[3] M.P. Shaikh: On digraphs with prescribed centers and peripheries. J. Undergrad. Math. 25 (1993), 31–42.
[4] S.J. Winters: Distance Associated with Subgraphs and Subdigraphs. Ph.D. Dissertation, Western Michigan University, 1993.
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