Dan Halperin, Micha Sharir, Kenneth Y. Goldberg. The 2-center problem with obstacles. In Symposium on Computational Geometry. pages 80-90, 2000. [doi]
@inproceedings{HalperinSG00,
title = {The 2-center problem with obstacles},
author = {Dan Halperin and Micha Sharir and Kenneth Y. Goldberg},
year = {2000},
doi = {10.1145/336154.336184},
url = {http://doi.acm.org/10.1145/336154.336184},
researchr = {https://researchr.org/publication/HalperinSG00},
cites = {0},
citedby = {0},
pages = {80-90},
booktitle = {Symposium on Computational Geometry},
}