Class visualization of high-dimensional data with applications. Computational Statistics & Data Analysis, (41)1:59-90, November 2002. [PUMA: alphaworks cluster clustering dm visualization] URL
A geometric approach to cluster validity for normal mixtures. Soft Computing - A Fusion of Foundations, Methodologies and Applications, (1)4:166--179, Dezember 1997. [PUMA: cluster evaluation index] URL
Finding Groups in Data: An Introduction to Cluster Analysis. John Wiley, 1990. [PUMA: clustering evaluation cluster]
Objective criteria for the evaluation of clustering methods. Journal of the American Statistical Association, (66)336:846-850, 1971. [PUMA: cluster clustering criteria evaluation index rand]