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4. Paul R. Cooper, “Structure Recognition by Connectionist Relaxation: Formal Analysis,” Computational Intelligence, 8(1):25–44, 1992.
5. Paul R. Cooper, Daniel E. Friedmann, and Scott A. Wood, “The Automatic Generation of Digital Terrain Models from Satellite Images by Stereo,” Acta Astronautica, 15(3):171–180, March 1987.