1. C.R. Hill, J.C. Bamber G.R. ter Haar (eds.), Physical Principles of Medical Ultrasonics, 2nd edn. (Wiley, 2004)
2. G.R. ter Haar, Prog. Biophys. Mol. Biol. 93, 111 (2007)
3. A.N. Rybyanets, in Piezoelectrics and Related Materials: Investigations and Applications, Chap. 5, eds. by I.A. Parinov (Nova Science Publishers Inc., New York, 2012), p. 143
4. W. Summer, M.K. Patrick, Ultrasonic Therapy—a textbook for physiotherapists (Elsevier, London, 1964)
5. M. Dyson, M. Brookes, in Ultrasound, eds. by R.A. Lerski, P. Morley (Pergamon, Oxford, 1983), p. 61