@article {uvigo:boundary-processing, title = {Linear Boundary Extensions for Finite Length Signals and Paraunitary Two-Channel Filter Banks}, journal = {IEEE Transactions on Signal Processing}, volume = {52}, number = {11}, year = {2004}, month = {November}, pages = {3213-3226}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} }