M. Moraga, C. Calero, M. Piattini, and D. Walker. ICSOFT (Selected Papers), volume 10 of Communications in Computer and Information Science, page 195-203. Springer, (2006)
A. Caro, C. Calero, I. Caballero, and M. Piattini. WEBIST (Selected Papers), volume 1 of Lecture Notes in Business Information Processing, page 228-237. Springer, (2006)