1. High Resolution 3-D scanner from ATS AB. ATS AB, Olof Wijksg. 3, S-412 55 Gothenburg, Sweden.
2. Svanå Miljöteknik AB. Diffuser & absorbent products for better acoustics (http://www.diffusor.com).
3. Measurement of directional scattering coefficients using near-field acoustic holography and spatial transformation of sound fields;Kleiner;Journal of the Audio Engineering Society of America,1997
4. Determination of the directivity of a planar noise source by means of nearfield acoustical holography, 2;Rowell;Journal of Sound and Vibration,1995