1. The Theory of Self-Reproducing Automata;von Neumann,1966
2. Cellular Automata;Codd,1968
3. Self-reproducing in cellular automata;Langton;Physica D,1984
4. Studying artificial life with cellular automata;Langton;Physica D,1986
5. Self-reproducing automata and the origin of life;Newman;Perspectives on Science and Christian Faith,1988