1. CAD/CAM theory and practice;Zeid,1991
2. Engineering and the mind's eye;Ferguson,1992
3. The importance of drawing in the mechanical design process;Ullman;Comput Graphics,1990
4. The importance of free-hand sketching in conceptual design automatic sketch input;Jenkins;Design Theory Methodol,1993
5. Conceptual design and analysis by sketching;Lipson;J AI Design Manuf,2000