1. Sedra, A.S., and Brackett, P.O.: ‘Filter theory and design’, , 10, (Pitman London 1978), p. 593–594
2. Bowron, P., and Stephenson, F.W.: ‘Active filters for communications and instrumentation’, , 9, (Mcgraw-Hill Maidenhead 1979), p. 251–254
3. Sensitivity analysis and dynamic range of quad filters and some comparative results
4. Synthesis of Multiple-Feedback Active Filters