1. Active Filter Design;Williams,1975
2. Reference Data for Radio Engineers,1967
3. Handbook of Filter Synthesis;Zverev,1967
4. Sensitivity Minimisation in a Single Amplifier Biquad Circuit;Fleischer;IEE Trans. Circuits Syst.,1976
5. Transistor High-Fidelity Pre-Amplifier;Tobey;Wireless World,1961