1. BSI Engineering Drawing Practice BS308,1972
2. The synthesis of solids bounded by many faces;Braid;Communs Ass. Comput. Mach.,1975
3. Automatic digitizing of engineering drawings;Altman,1978
4. PEPR - a random access film scanning system;Brooks,1972
5. An investigation into techniques for automated data acquisition from graphical images;Clement,1979