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3. S.J. Orfanidis, Introduction to Signal Processing (Prentice Hall, 2010). ISBN 0-13-209172-0
4. P. Dutilleux, U. Zölzer, Filters, in DAFX, Digital Audio Effects (John Wiley & Sons Inc., 2002), pp. 31–62
5. D. Rocchesso, Introduction to Sound Processing. ISBN-10: 8890112611, http://freecomputerbooks.com/Introduction-to-Sound-Processing.html (2004)