@article{102502, author = {Gary Chartrand and Song Lin Tian}, title = {Oriented graphs with prescribed $m$-center and $m$-median}, journal = {Czechoslovak Mathematical Journal}, volume = {41}, year = {1991}, pages = {716-723}, zbl = {0759.05033}, mrnumber = {1134960}, language = {en}, url = {http://dml.mathdoc.fr/item/102502} }
Chartrand, Gary; Tian, Song Lin. Oriented graphs with prescribed $m$-center and $m$-median. Czechoslovak Mathematical Journal, Tome 41 (1991) pp. 716-723. http://gdmltest.u-ga.fr/item/102502/
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