Reference:
The Aligned k-Center Problem (Peter Brass, Christian Knauer, Hyeon-Suk Na, Chan-Su Shin, Antoine Vigneron), In Int. J. Comput. Geometry Appl., volume 21, 2011.
Bibtex Entry:
@article{journals/ijcga/BrassKNSV11,
author = {Peter Brass and
Christian Knauer and
Hyeon-Suk Na and
Chan-Su Shin and
Antoine Vigneron},
title = {The Aligned k-Center Problem},
journal = {Int. J. Comput. Geometry Appl.},
volume = {21},
number = {2},
year = {2011},
pages = {157-178},
doi = {10.1142/S0218195911003597}
}