http://dewey.info/scheme/edition/e23/ en
621.382 Communications engineering
621.3822 Signal processing
621.38223 Signal analysis and theory 621.38224 Interference and noise
http://dewey.info/scheme/edition/e22/ de
621.382 Kommunikationstechnik
621.3822 Signalverarbeitung
621.38223 Signalanalyse und Signaltheorie 621.38224 Interferenz und Rauschen
Dewey Decimal Classification
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