@inproceedings{bdnsz-pttp-05
, author = {Pankaj Agarwal and Sergey Bereg and Haim Kaplan and Ovidiu Daescu
and Simeon Ntafos and Binhai Zhu}
, title = {Guarding a Terrain by Two Watchtowers}
, booktitle = {Proc. 21th Annu. ACM Sympos. Comput. Geom.}
, year = {2005}
, pages = {346--355}
, url = {http://doi.acm.org/10.1145/1064092.1064145}
}