C. Bühler, H. Heck, and J. Becker. Proceedings of the 11th international conference on Computers Helping People with Special Needs, page 973--980. Berlin, Heidelberg, Springer-Verlag, (2008)
Y. Becker, P. Fei, and A. Lester. Genetic Programming Theory and Practice IV, volume 5 of Genetic and Evolutionary Computation, chapter 12, Springer, Ann Arbor, (11-13 May 2006)
K. Becker, G. Stumme, R. Wille, U. Wille, and M. Zickwolff. Knowledge Engineering and Knowledge Management. Methods, Models, and Tools., volume 1937 of LNAI, page 352-365. Heidelberg, Springer, (2000)
K. Becker, G. Stumme, R. Wille, U. Wille, and M. Zickwolff. Knowledge Engineering and Knowledge Management. Methods, Models, and Tools., volume 1937 of LNAI, page 352-365. Heidelberg, Springer, (2000)