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"Unitary root-MUSIC with a real-valued eigendecomposition: atheoretical and experimental performance study
Pesavento", M.; Gershman, A.B.; Haardt, M.

"Recursive Complex Blind Source Separation via Eigendecomposition of Cumulant Matrices"
Pokharel, P.P.; Ozertem, U.; Erdogmus, D.; Principe, J.C.

http://rapidshare.com/files/139722794/1.pdf.html