Approximation of geometric dispersion problems
Christoph Baur
and Sándor P. Fekete
Algorithmica 30(3):451–470, Jul 2001
Proc. Int. Worksh. Approximation Algorithms for Combinatorial Optimization (APPROX 1998), Lecture Notes in Computer Science 1444, Klaus Jansen
and Dorit Hochbaum, ed., Springer-Verlag, Jul 1998, pp. 63–75
http://www.zpr.uni-koeln.de/~paper/paper.php3?paper=296
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