1. Why we are here and where we are going: the evolution of CAD;Eastman,1989
2. Representing spatial abstractions of constructed facilities;Zamanian;Building and Environment,1991
3. SHARED: an information model for cooperative product development;Wong;Research in Engineering Design,1993
4. Vertex-based representation of non manifold boundaries;Gursoz,1990
5. New features of geometric modelling for product description;Kimura,1990