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S.G. Schalk, L. Demi, M. Smeenge, D.M. Mills, K.D. Wallace, J.J.M.C.H. de la Rosette, H. Wijkstra, M. Mischi, IEEE Trans on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 62, no. 5, pp. 839-851, 2015.