Ed. Michalon, Paris 1997, coll. Le Bien Commun, ISBN : 2684186-071 - X. 122 pages
Editions REPAS, 2008, ISBN 2-9520180-6-5
Volume V of the Santa Fé Institute Studies in the Sciences of Complexity, AddisonWesley Pub. Cy. N.Y. 1988. 317 p.