@conference {Eusipco02_bss, title = {Estimation of the mixing matrix for underdetermined blind source separation using spectral estimation techniques}, booktitle = {XI European Signal Processing Conference (Eusipco 2002)}, year = {2002}, month = {September}, address = {Toulouse, France}, author = {Vielva, Luis and Santamar{\'\i}a, Ignacio and Pantale{\'o}n, Carlos and Ib{\'a}{\~n}ez, Jes{\'u}s and Erdogmus, Deniz and Pr{\'\i}ncipe, Jos{\'e} C.} }