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2009 IEEE Sensors > 217 - 221
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control > 2008 > 55 > 5 > 946 - 951
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control > 2002 > 49 > 5 > 626 - 634
Electronics Letters > 1989 > 25 > 6 > 409 - 410