Design of analog filters 2026-02-16T04:37:20+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Schaumann, Rolf, 1941-; Van Valkenburg, M. E. (Mac Elwyn), 1921-1997 (The Oxford series in electrical and computer engineering, 2010)