Author: Tian, Song Lin
- : Oriented graphs with prescribed $m$-center and $m$-median. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 4, pp. 716-723
- : Steiner distance in graphs. (English). Časopis pro pěstování matematiky, vol. 114 (1989), issue 4, pp. 399-410
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