https://pure.psu.edu/en/publications/tunable-rf-filters-using-thin-film-barium-strontium-titanate-base/
Tunable RF filters using thin film barium strontium titanate based capacitors - Penn State
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https://research.utwente.nl/en/publications/8-path-tunable-rf-notch-filters-for-blocker-suppression/fingerprints/
8-Path Tunable RF Notch Filters for Blocker Suppression - Fingerprint - University of Twente...
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