Subquadratic approximation algorithms for clustering problems in high dimensional spaces

Allan Borodin, Rafail Ostrovsky, and Yuval Rabani
Proc. 31st Symp. Theory of Computing, ACM, May 1999, pp. 435–444

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Fast hierarchical clustering and other applications of dynamic closest pairs

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