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Perlin, K. & Fox, D. (1993). Pad: An alternative approach to the computer interface. Proceeding of SIGGRAPH 93, 57-64. New York, NY: ACM.
PDF: http://www.mrl.nyu.edu/publications/sig93-pad/siggraph-93-origpad.pdf
CiteSeer: http://citeseer.ist.psu.edu/perlin93pad.html