1. Variations of geometries based on a geometric-reasoning method;Aldefeld;Computer-Aided Design,1988
2. Rule-based variational geometry in Computer-Aided Design;Aldefeld,1992
3. Un micro-monde de géométrie—Cabri-Géomètre;Baulac,1990
4. Algebraic specification of a 3D-modeller based on hypermaps;Bertrand;Computer Vision—GMIP,1994
5. Algebraic specification and development in geometric modeling;Bertrand,1993