1. Approximation Methods for Electronic Filter Design;DANIELS,1974
2. Principles of Active Network Synthesis and Design;DARYANANI,1976
3. Linear and Conversion Applications Handbook;GIVENS,1986
4. ‘Sensitivity of 2nd order Sallen–Key type active R.C. filters’;SARAGA;Electron. Lett.,1967
5. LIM, J. T., ‘Improvements in or relating to active filter networks’, British Patent Application 9657 (dated 16 April, 1971)