1. Research note A new OTA-based active-C oscillator
2. AHMED , M. T. , and ALAM , M. S. , 1984 , Realization of electronically tunable OTA based multifunctional filters .Proceedings of the I.E.E.E. International Conference on Computers, Systems and Signal Processing, Vol. 3 , 1378 – 1382 .
3. Inductorless Bandpass Characteristics Using All-Pass Networks
4. GEIGER , R. L. , and FERRELL , J. , 1983 , Voltage controlled filter design using operational trans-conductance amplifiers .Proceedings of the I.E.E.E. International Symposium on Circuits and Systems, Vol. 2 , 594 – 597 .
5. Realisation of the circulator concept using differential-input operational amplifiers