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Mather, George (1987) The dependence of edge displacement thresholds on edge blur, contrast, and displacement distance. Vision Research, 27 (9). pp. 1631-1637. ISSN 0042-6989
Hammond, Nick and Allinson, Lesley (1987) The travel metaphor as design principle and training aid for navigating around complex systems. In: Third Conference of the British Computer Society Human-Computer Interaction Specialist Group, 7-11 September 1987, University of Exeter.