Discrete-time signal processing 2026-02-15T20:28:08+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Oppenheim, Alan V.; Schafer, Ronald W., 1938- (Pearson, 2014)