1. Gyrators using operational amplifiers
2. ON ANALOG FEEDBACK CONTROL FOR MAGNETOSTRICTIVE TRANSDUCER LINEARIZATION
3. The Biquad: Part I-Some Practical Design Considerations; Part II-A Multipurpose Active Filtering System;Thomas;IEEE Transactions on. Circuit Theory,1971
4. A Versatile Active RC Building Block with Inherent Compensation for the Finite Bandwidth of the Amplifier;Ackerberg;IEEE Transactions on Circuits and Systems,1974