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IEEE Sensors Journal > 2010 > 10 > 7 > 1276 - 1281
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control > 2009 > 56 > 2 > 379 - 386
IEEE Sensors Journal > 2008 > 8 > 7 > 1194 - 1201
IEEE Sensors Journal > 2008 > 8 > 7 > 1184 - 1193