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Schmalhofer, Franz and Kühn, Otto and Messamer, Paula and Charron, Rhona (1990) An experimental evaluation of different amounts of receptive and exploratory learning in a tutoring system. Computers in Human Behavior 6 (1), pp. 51-68.
Schmalhofer, Franz and Kühn, Otto and Charron, Rhona and Messamer, Paula (1990) An implementation and empirical evaluation of an exploration environment with different tutoring strategies. Behavior research methods, instruments & computers 22 (2), pp. 179-183.