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Books about Rousseeuw:
Finding Groups in Data: An Introduction to Cluster Analysis 99th edition by Kaufman, Leonard; Rousseeuw, Peter... (Mar 1, 1990)
Wiki information Rousseeuw:
Peter J. Rousseeuw is a Belgian statistician known for his work on robust statistics and cluster analysis.
Silhouette refers to a method of interpretation and validation of clusters of data. The technique provides a succinct graphical representation of how well each object lies within its cluster. It was first described by Peter J. Rousseeuw in 1986.