1. “Triode Network Topology”;KEEN;IRE Trans on Circuit Theory,1959
2. “A topological nonreciprocal network element”;Proc. I.R.E.,1959
3. “Immittance properties of nonreciprocal networks”;Proc. I.R.E.,1960
4. (d) “Ideal three-terminal active networks”, Proceedings of the Symposium on Active Networks and Feedback Systems, Poly. Inst, of Brooklyn MRI Symposia Series, Vol. X, pp. 201–240 Interscience Publishers, 1961.
5. (e) “Immittance synthesis in the nonreciprocal domain”, (An expansion of 3.2–3.4) Unpublished.