MARIANO RICO, FRANCISCO GARCIA-SANCHEZ+, JUAN M. GOMEZ++, RAFAEL VALENCIA-GARCIA+ AND JESUALDO T. FERNANDEZ-BREIS+
Computer Science Departament
Universidad Autonoma de Madrid
Madrid, 28049 Spain
+Department of Informatics and Systems
University of Murcia
30100 Murcia, Spain
++Department of Computer Science
Universidad Carlos III
28911 Madrid, Spain