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  2. D.E. Johnson, Applied Multivariate Methods for Data Analysts, Duxbury Press, Pacific Grove,California, 1998.

  3. R.J. Schalkoff, Pattern Recognition: Statistical, Structural and Neural Approaches, John Wiley & Sons Inc., New York, 1992.

  4. H. Klock and J.M. Buhmann, Data Visualization by Multidimensional Scaling: A Deterministic Annealing Approach, EMMCVPR'97, Venice, Italy, 1997.