Article (RePEc:eee:csdana:v:41:y:2002:i:1:p:59-90)
Dhillon, I. S.; Modha, D. S. & Spangler, W. S.
Class visualization of high-dimensional data with applications
Computational Statistics & Data Analysis, 2002, 41, 59-90

Article (bezdek1997)
Bezdek, J. C.; Li, W. Q.; Attikiouzel, Y. & Windham, M.
A geometric approach to cluster validity for normal mixtures
Soft Computing - A Fusion of Foundations, Methodologies and Applications, 1997, 1, 166-179

Book (kaufman1990finding)
Kaufman, L. & Rousseeuw, P. J.
Finding Groups in Data: An Introduction to Cluster Analysis
John Wiley, 1990

Article (rand1971)
Rand, W.
Objective criteria for the evaluation of clustering methods
Journal of the American Statistical Association , 1971, 66, 846-850