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A. Rizzo, J. G. Buckwalter, P. Larson, A. Van Rooyen, K. Kratz, U. Neumann, C. Kesselman, and M. Thiebaux, "Preliminary Findings on a Virtual Environment Targeting Human Mental Rotation/spatial Abilities", Proceedings of the 2\textsuperscript{nd} European Conference on Disability, Virtual Reality and Associated Techniques, Sköve, Sweden, pp. 213–220, 1998.