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IEEE Sensors Journal > 2010 > 10 > 9 > 1440 - 1446
IEEE Journal of Selected Topics in Quantum Electronics > 2010 > 16 > 4 > 833 - 840
IEEE Sensors Journal > 2008 > 8 > 5 > 548 - 557
IEEE Transactions on Biomedical Circuits and Systems > 2007 > 1 > 1 > 3 - 18