1. RC-active synthesis using positive-immittance convertors
2. Simulated Inductance using Differential Amplifiers;Riordan;Electronic Letters,1967
3. A circuit for floating inductance simulation
4. The Gyrator, A New Electric Network Element;Tellegen;Philips Research Reports,1948
5. Realization of Gyrators using Operational amplifiers and Their Use in Active Network Synthesis;Antoniou;IEE Proceedings,1969