1. David Ackley and Michael Littman. Interactions Between Learning and Evolution. In Christopher Langton et al., ed., Artificial Life II. Addison-Wesley 407–509, 1992.
2. Rodney A. Brooks. Elephants Don't Play Chess. In Pattie Maes, ed., Designing Autonomous Agents. MIT Press, 1990.
3. Jose C. Brustoloni. Autonomous Agents: Characterization and Requirements. Carnegie Mellon Technical Report CMU-CS-91-204, Carnegie Mellon University 1991.
4. Vincent G. Dethie. The Magic of Metamorphosis: Nature's Own Sleight of Hand. Smithsonian, (17): 122 ff, 1986.
5. Oren Etzioni and Daniel Weld. A Softbot-Based Interface to the Internet. Communications of the ACM, (37) 7: 72–79, 1994.