1. Bernadó, E., Llorà, X., Garrell, J.M.: XCS and GALE: A comparative study of two learning classifier systems and six other learning algorithms on classification tasks. In Lanzi, P.L., Stolzmann, W., Wilson, S.W., eds.: Advances in Learning Classifier Systems: 4th International Workshop, IWLCS 2001. Springer-Verlag, Berlin Heidelberg (2002) 115–132
2. Butz, M.V., Kovacs, T., Lanzi, P.L., Wilson, S.W.: Theory of generalization and learning in XCS. IEEE Transaction on Evolutionary Computation submitted, 2003) also available as IlliGAL technical report 2002011 at http://wwwilligal.ge.uiuc.edu/techreps.php3.
3. Butz, M.V., Kovacs, T., Lanzi, P.L., Wilson, S.W.: How XCS evolves accurate classifiers. Proceedings of the Genetic and Evolutionary Computation Conference (GECCO 2001) (2001) 927–934
4. Butz, M.V., Pelikan, M.: Analyzing the evolutionary pressures in XCS. Proceedings of the Genetic and Evolutionary Computation Conference (GECCO 2001) (2001) 935–942
5. Butz, M.V., Sastry, K., Goldberg, D.G.: Tournament selection in XCS. Proceedings of the Genetic and Evolutionary Computation Conference (GECCO 2003) (2003) this volume.