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https://publications.hse.ru/pubs/share/direct/214516753.pdf

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https://www.reddit.com/r/AskElectronics/comments/evk9rm/whats_the_purpose_of_active_and_passive/%3Ftl%3Dru

https://mlsd2023.ipu.ru/proceedings/0570.pdf

https://electronix.ru/forum/topic/136165-printsip-raboty-cic-filtra/