1. Normality-based validation for crisp clustering;Lago-Fernández;Pattern Recogn.,2010
2. Towards a standard methodology to evaluate internal cluster validity indices;Gurrutxaga;Pattern Recogn. Lett.,2011
3. clValid: An R Package for Cluster Validation;Brock,2008
4. Package ClusterCrit for R;Desgraupes,2013
5. Package ‘cclust’;Dimitriadou,2014