Approximation schemes for Euclidean $k$-medians and related problems

Sanjeev Arora, Prabhakar Raghavan, and Satish Rao
Proc. 30th Symp. Theory of Computing, ACM, May 1998, pp. 106–113

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Approximation algorithms for geometric problems

Fano Experimental Web Server, D. Eppstein, School of Information & Computer Science, UC Irvine