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- [6] WAVE ACTIVE-FILTERS PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON, 1976, 123 (07): : 676 - 682
- [8] TECHNIQUES SIMPLIFY ACTIVE-FILTERS EDN MAGAZINE-ELECTRICAL DESIGN NEWS, 1984, 29 (13): : 280 - &
- [9] ACTIVE-FILTERS AND HYBRID TECHNOLOGY ELECTROCOMPONENT SCIENCE AND TECHNOLOGY, 1980, 6 (02): : 67 - 85