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- Hampshire College, Division III thesis, (May 2001)
- Thomas Weise, second edition, (2008)
- Late Breaking Papers at the 1997 Genetic Programming Conference, page 174--179. Stanford University, CA, USA, Stanford Bookstore, (January 1998)
- Late Breaking Papers at the Genetic Programming 1998 Conference, page 135--142. University of Wisconsin, Madison, Wisconsin, USA, Stanford University Bookstore, (October 1999)
- RR4218. INRIA, Domaine de Voluceau - Rocquencourt - B.P. 105 78153 Le Chesnay Cedex France, (June 2001)
- Proceedings of the Genetic and Evolutionary Computation Conference, 2, page 1229. Orlando, Florida, USA, Morgan Kaufmann, (January 2000)Full text in technical report CSRP-99-7 .
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