1. E.F. Codd, Cellular Automata, Academic Press, NY, 1968.
2. Hugo de Garis, “Genetic Programming: Modular Evolution for Darwin Machines,” ICNN-90WASH-DC, (Int. Joint Conf. on Neural Networks), January 1990, Washington DC, USA.
3. Hugo de Garis, “Genetic Programming”, Ch.8 in book Neural and Intelligent Systems Integration, ed. Branko Soucek, Wiley, NY, 1991.
4. Hugo de Garis, “Artificial Embryology: The Genetic Programming of an Artificial Embryo”, Ch.14 in book Dynamic, Genetic, and Chaotic Programming, ed. Branko Soucek and the IRIS Group, Wiley, NY, 1992.
5. Hugo de Garis, “Evolvable Hardware: Genetic Programming of a Darwin Machine”, in Artificial Neural Nets and Genetic Algorithms, R.F. Albrecht, C.R. Reeves, N.C. Steele (eds.), Springer Verlag, NY, 1993.