1. Technical drawings — Geometrical tolerancing — Tolerances of form, orientation, location and run-out — Generalities, definitions, symbols, indications on drawings;ISO 1101,1983
2. Conceptual graphs in CAD;Salomons;CIRP Annals,1994
3. Spatial Technology;ACIS Geometric modeler,1994
4. Computer support in the design of mechanical products, constraint specification and satisfaction in feature based design for manufacturing;Salomons,1995