Factor Analysis to Support the Visualization and Interpretation of Clusters of Portal Users. - Carmen Rebelo; Pedro Quelhas Brito; Carlos Soares; Alípio Mário Jorge (Web Intelligence, 2006)

Quantitative Evaluation of Clusterings for Marketing Applications: A Web Portal Case Study. - Carmen Rebelo; Pedro Quelhas Brito; Carlos Soares; Alípio Mário Jorge; Rui Brandão (EPIA Workshops, 2007)