Aritra Banik Binay K. Bhattacharya Sandip Das 0001 Tsunehiko Kameda Zhao Song 0002 The $p$-Center Problem in Tree Networks Revisited. 2016 abs/1604.07535 CoRR http://arxiv.org/abs/1604.07535 db/journals/corr/corr1604.html#BanikBDKS16