Site internet franco-portugais de l'atelier MCX 34
éditions Economica, Paris, 2002, ISBN 2 7178 4461 9, 363 pages
Ed. Economica Paris 1991. 213 p.
Volume V of the Santa Fé Institute Studies in the Sciences of Complexity, AddisonWesley Pub. Cy. N.Y. 1988. 317 p.