Mikhail V. Nesterenko Victor A. Katrich Yuriy M. Penkin Victor M. Dakhov Sergey L. Berdnik Thin Impedance Vibrators - Theory and Applications 95 2011 1-198 Springer Lecture Notes in Electrical Engineering http://dx.doi.org/10.1007/978-1-4419-7850-9 978-1-4419-7849-3 db/series/lnee/index.html#NesterenkoKPDB11