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- [5] FREQUENCY LIMITATIONS OF ACTIVE-R FILTERS USING OPERATIONAL-AMPLIFIERS JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS, 1979, 308 (02): : 141 - 151
- [9] BRIDGE NEGATIVE RESISTANCES USING TWO OPERATIONAL AMPLIFIERS. Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika), 1978, 32-33 (01): : 126 - 128