1. Fourier Analysis and Approximation;Butzer,1971
2. Ten Lectures on Wavelets;Daubechies,1992
3. A First Course on Wavelets;Hernández,1996
4. Time-Frequency Analysis of Signals Using Generalized Wavelet Packets;Hess-Nielsen,1992
5. Control of frequency spreading of wavelet packets;Hess-Nielsen;Appl. Comput. Harmon. Anal.,1994