References

Anderberg, M.R. (1973), Cluster Analysis for Applications , New York: Academic Press.

Hand, D.J., Daly, F., Lunn, A.D., McConway, K.J., and Ostrowski, E. (1994), A Handbook of Small Data Sets , London: Chapman and Hall, 297 “298.

Legendre, L. and Legendre, P. (1983), Numerical Ecology , New York: Elsevier Scientific Pub. Co.

Kaufman, L. and Rousseeuw, P.J. (1990), Finding Groups in Data , New York: John Wiley and Sons, Inc.

Sneath, P.H.A. and Sokal, R.R. (1973), Numerical Taxonomy , San Francisco: Freeman.