1. Non-gridded graphic input;Rutman,1976
2. CASS: Computer aided schematic system;Bayegan,1977
3. An integrated system for interactive editing of schematics logic simulation and PCB layout design;Bayegan,1978
4. SCALD: Structured computer-aided logic design;McWilliams,1978
5. Logic diagram recognition by divide and synthesize method;Kakumoto,1978