MIT Press*"Echoing Emergence: objectives, rough definitions, and speculations for ECHO-class models", in: George A. Cowan, David Pines, David Meltzer, editors.
1992* 1994, "Echoing Emergence: objectives, rough definitions, and speculations for ECHO-class models", in: George A. Cowan, David Pines, David Meltzer, editors.