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- T. Deliyannis and S. Fotopoulos, "High-order Filter realization by cascading Biquartic Sections", Proc. ECCTD 81, Hague 25-28, Sept 1981, pp. 962-966.
- T. Deliyannis, "Optimization factors for the design of Active Filters". Proc. 1st IMACS Panhellenic Seminar on "Simulation, Optimization and Systems Control", Athens 7-10 Dec. 1981, (in Greek).