• Nonlinear acoustic NDE-qualitative and quantitative effectsEngelbrecht, Jüri; Ravasoo, Arvi; Janno, JaanMultifunctional materials and structures : selected, peer reviewed papers from International Conference on Multifunctional Materials and Structures : July 28-31, 2008, Hong Kong, P.R.China2008 / p. 17-20 https://www.scientific.net/AMR.47-50.17