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- [7] ANALYSIS AND SYNTHESIS OF RC-ACTIVE FILTERS WITH NON-IDEAL AMPLIFIERS NACHRICHTENTECHNISCHE ZEITSCHRIFT, 1972, 25 (06): : 281 - &
- [8] BROADBANDING TECHNIQUES FOR RC-ACTIVE FILTERS WITH 2 OPERATIONAL-AMPLIFIERS NACHRICHTENTECHNISCHE ZEITSCHRIFT, 1978, 31 (04): : 289 - 292