1. Rabiner, L.R. and Gold, B. (1975) Theory and Application of Digital Signal Processing. Prentice-Hall, Englewood Cliffs.
2. Oppenheim, A.V. (1978) Applications of Digital Signal Processing. Prentice Hall, Hoboken, New Jersey.
3. Roberts, R.A. and Mullis, C.T. (1987) Digital Signal Processing. Addison-Wesley Longman Publishing Co., Inc., Boston.
4. Smith, S.W., et al. (1997) The Scientist and Engineer’s Guide to Digital Signal Processing. http://www.dspguide.com/pdfbook.htm
5. Todorovska, M.I. (2001) Estimation of Instantaneous Frequency of Signals Using the Continuous Wavelet Transform. University of Southern California, Department of Civil Engineering, Los Angeles.