Frits L. Engel

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Engel, Frits L., Goossens, Peter, Haakma, Reinder (1994): Improved Efficiency through I- and E-Feedback: A Trackball with Contextual Force Feedback. In International Journal of Human-Computer Studies, 41 (6) pp. 949-974.

Engel, Frits L., Haakma, Reinder (1993): Expectations and Feedback in User-System Communication. In International Journal of Man-Machine Studies, 39 (3) pp. 427-452.

Engel, Frits L., Andriessen, J. J., Schmitz, H. J. R. (1983): What, Where and Whence: Means for Improving Electronic Data Access. In International Journal of Man-Machine Studies, 18 (2) pp. 145-160.