TY - CHAP A1 - Ritter, F. E. A1 - Nerb, J. A1 - Kindsmüller, Martin Christof T1 - Steps toward a series of models for a developmental task T2 - Proceedings of the EuroSoar 8 Workshop, Graduate School of Experimental Psychology, University of Leiden, NL Y1 - 1994 SP - 95 EP - 99 ER -