A Fuzzy Rule-Based Agent for Web Retrieval-Filtering. - Spyros Vrettos; Andreas Stafylopatis (Web Intelligence, 2001)

An Intelligent Agent-Mediated Web Trading Environment. - Stelios Kouremenos; Spyros Vrettos; Andreas Stafylopatis (Web Intelligence, 2003)

An expert system for job matching of the unemployed. - Athanasios Drigas; Stelios Kouremenos; Spyros Vrettos; John Vrettaros; Dimitris Kouremenos (Expert Syst. Appl., 2004)

A Movie Recommender System Based on Semi-supervised Clustering. - Christina Christakou; Leonidas Lefakis; Spyros Vrettos; Andreas Stafylopatis (CIMCA/IAWTIC, 2005)

A Hybrid Movie Recommender System Based on Neural Networks. - Christina Christakou; Spyros Vrettos; Andreas Stafylopatis (Int. J. Artif. Intell. Tools, 2007)