1 K.M. Larson, and J.. Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 45, (1998).
1 S.R. Jefferts, M.A. Weiss, J.. Levine, S.. Dilla, E.W. Bell, and T.E. Parker, IEEE Transactions on Instrumentation and Measurement 46, (1997).