1. D.L. Massart, L. Kaufman, The interpretation of analytical chemical data by the use of cluster analysis, Wiley, New York, 1983.
2. L. Kaufman, P.J. Rousseauw, Finding groups in data. An introduction to cluster analysis, Wiley, New York, 1990.
3. Estimating the number of clusters in a data set via the gap statistic
4. Z. Michalewicz, Genetic Algorithms + Data Structures = Evolution Programs, third ed. (revised and extended), Springer, 1996, p. 40.
5. MATLAB, The Language of Technical Computing—version 6.5.0.18091 3a Release 13, The MathWorks Inc., Natick, MA, June 2002.