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Patnaik, LM and Shenoy, RS and Krishnan, D (1986) Set theoretic operations on polygons using the scan-grid approach. In: Computer-Aided Design, 18 (5). pp. 275-279.
Krishnan, D and Patnaik, LM (1986) GEODERM: geometric shape design system using an entity-relationship model. In: Computer-Aided Design, 18 (4). pp. 207-218.
