Boundary Element Methods in Acoustics, Laplace and Helmholtz Problems
The boundary element method (BEM) and its application to acoustic simulation and the solution of Laplace and Helmholtz problems.
www.soundsoft.demon.co.uk/   reviews

Vallen-Systeme GmbH, The Acoustic Emission Company
Instrumentation, equipment and software for acoustic emission analysis and acoustic emission field test applications.
www.vallen.de/   reviews