@conference {Prelcic02a, title = {Smooth Orthogonal Signal Extensions for Paraunitary Tree-structured Filter Banks}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2002}, month = {May}, address = {Orlando, USA}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} }