1. Feedback Theory-Some Properties of Signal Flow Graphs;Mason,1953
2. Feedback Theory-Further Properties of Signal Flow Graphs;Mason,1956
3. Topological Formulas for Network Functions;Mayeda,1956
4. Topological Considerations in the Design of Driving Point Functions;Seshu;Transactions of the Professional Group on Circuit Theory, (IRE),1955
5. Some Topological Considerations in Network Theory;Reza;Transactions of the Professional Group on Circuit Theory, (IRE),1958