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Vossen, P. H., Sitter, S. and Ziegler, Jurgen (1987): An Empirical Validation of Cognitive Complexity Theory. In: Bullinger, Hans-Jorg and Shackel, Brian (eds.) INTERACT 87 - 2nd IFIP International Conference on Human-Computer Interaction September 1-4, 1987, Stuttgart, Germany. pp. 71-75.
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