Arie Tamir. p-Center Location Problem on a Graph. Math. Oper. Res., 12(2):340-349, 1987. [doi]
@article{Tamir87, title = {p-Center Location Problem on a Graph}, author = {Arie Tamir}, year = {1987}, doi = {10.1287/moor.12.2.340}, url = {http://dx.doi.org/10.1287/moor.12.2.340}, researchr = {https://researchr.org/publication/Tamir87}, cites = {0}, citedby = {0}, journal = {Math. Oper. Res.}, volume = {12}, number = {2}, pages = {340-349}, }