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2008 Congress on Image and Signal Processing > 3 > 398 - 402
IEEE Transactions on Signal Processing > 2008 > 56 > 8-1 > 3600 - 3612
IEEE Transactions on Signal Processing > 2008 > 56 > 8-2 > 3944 - 3958
1993 IEEE International Conference on Acoustics, Speech, and Signal Processing > 4 > 125 - 128 vol.4