J.E. Barros, J. French, W. Martin, P.M. Kelly, and T.M. Cannon. 

<B>Using the triangle inequality to reduce the number of comparisons required for similarity-based retrieval</B>. 

In SPIE Vol. 2670 Storage and Retrieval for Still Image and Video Databases IV, pages 392-403, 1996. 
Los Alamos National Laboratory Technical Report LA-UR-96-62.

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