1. M.S. Aldenderfer and R.K. Blashfield. Cluster Analysis. Sage, USA, 1984.
2. C. Bajaj. Geometric Optimization and Computational Complexity. PhD thesis, D. Computer Science, Cornell University, NY, 1984.
3. C. Bajaj. Proving geometric algorithm non-solvability: An application of factoring polynomials. J. Symbolic Computation, 2:99–102, 1986.
4. P.S. Bradley, U. Fayyad, and C. Reina. Scaling clustering algorithms to large databases. R. Agrawal and P. Stolorz, eds, Fourth Int. Conf. on Knowledge Discovery and Data Mining, pages 9–15. AAAI Press, 1998.
5. P.S. Bradley, O.L. Mangasarian, and W.N. Street. Clustering via concave minimization. Advances in neural information processing systems, 9:368–, 1997.