Cresus: An Integrated Expert System for Cash Management. - Peter Shell; Gonzalo Quiroga Barro; Juan Antonio Hernandez Rubio; Eduardo Encinas; José García; Javier Berbiela (IAAI, 1992)

Improving Search through Diversity. - Peter Shell; Juan Antonio Hernandez Rubio; Gonzalo Quiroga Barro (AAAI, 1994)