AgaShaWel-DCG-98

@article{AgaShaWel-DCG-98,
title = {The discrete 2-center problem},
author = {Pankaj Kumar Agarwal and Micha Sharir and Emo Welzl},
journal = {Discrete & Computational Geometry},
volume = {20},
number = {3},
pages = {287--305},
month = {Oct},
year = {1998}}