Ed. l'Arche, Paris, 2000, ISBN 2-85181-471-0, 221 pages
Ed du Seuil, ISBN 2 02 051234 3, 2001, 150 pages.
Volume V of the Santa Fé Institute Studies in the Sciences of Complexity, AddisonWesley Pub. Cy. N.Y. 1988. 317 p.