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2. ‘A new type of digital filter with a reciprocal ladder configuration’, IEEE Int. Symp. Circuit Theory, Digest of Technical Papers, 129–130 (1970).
3. Some principles of designing digital filters imitating classical filter structures
4. ‘Wave digital filters’, Proc. Summer School Circuit Theory, Institute of Radio Engineering and Electronics, Czechoslovak Academy of Sciences, 11–1 to 11–10 (1971).