Site internet franco-portugais de l'atelier MCX 34
Ed. de l'Aube, La Tour d'Aygues 84240. 96 pages.
, Editions Odile Jacob, Paris, 1994. 622 p.
Volume V of the Santa Fé Institute Studies in the Sciences of Complexity, AddisonWesley Pub. Cy. N.Y. 1988. 317 p.