1. A bibliography of notch filters — active, passive, digital, lumped, distributed and integrated;Kumar;IEEE J. Circuits Systems,1980
2. RC passive notch filters;Khan;J. IETE,1976
3. Handbook of Filter Synthesis;Zverev,1967
4. A dual-input RC null network;Swamy,1966
5. Notch networks with adjustable notch depth and notch frequency;Anand Mohan,1976