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Where can I find a proof for the Schur-Cohn stability test?

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A reference is: Proakis J.G., Manolakis D.G., “Digital Signal Processing”, Prentice Hall, 1996.

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Thanks Jorg! I found another document, which I suppose gives an easier proof as compared to going through the Proakis's bulky chapter on Lattice Filters to figure it out. –  Mohan Apr 16 '13 at 7:31

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