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IEEE Sensors Journal > 2008 > 8 > 7 > 1317 - 1323
IEEE Transactions on Signal Processing > 2008 > 56 > 8-1 > 3613 - 3626
IEEE Transactions on Signal Processing > 2008 > 56 > 8-1 > 3385 - 3396
IEEE Transactions on Biomedical Engineering > 2008 > 55 > 8 > 2087 - 2093