Dan Trietsch. Optimal multifacility defensive location on planes with rectilinear distances. Networks, 23(6):517-523, 1993. [doi]
@article{Trietsch93,
title = {Optimal multifacility defensive location on planes with rectilinear distances},
author = {Dan Trietsch},
year = {1993},
doi = {10.1002/net.3230230602},
url = {http://dx.doi.org/10.1002/net.3230230602},
researchr = {https://researchr.org/publication/Trietsch93},
cites = {0},
citedby = {0},
journal = {Networks},
volume = {23},
number = {6},
pages = {517-523},
}