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2. Set models and Boolean operations for solids and assemblies;Arbab;IEEE Comput. Graphics Appl.,1990
3. Superquadrics and angle-preserving transformations;Barr;IEEE Comput. Graphics Appl.,1981
4. The use of algebraic functions as a solid modeling alternative: an investigation;Blechschmidt;16th ASME Design Automation Conference,1990