M.  Keijzer, Tettamanzi, A., Collet, P., van Hemert, J., and Tomassini, M., ?Genetic Programming, Proceedings of the 8th European Conference?, Lecture Notes in Computer Science, vol. 3447. Springer, 2005.

J.  Eggermont and van Hemert, J. I., ?Adaptive Genetic Programming Applied to New and Existing Simple Regression Problems?, in Springer Lecture Notes on Computer Science, 2001, p. 23--35.