Texte dans un périodique Dorin, Alan ; Bull, Larry. – «Metacreation: art and artificial life». – Artificial life. – Vol. 12, no. 4 (Fall 2006). – Critique de l'essai de Mark Hansen , «Metacreation: art and artificial life». – P. 635-637.
Texte dans un périodique Hurst, Jacob ; Bull, Larry. – «A neural learning classifier system with self-adaptive constructivism for mobile robot control». – Artificial life. – Vol. 12, no. 3 (Summer 2006). – P. 353-380.