1. Imagine WP 6 consortium, Rail noise database and manual for implementation, Image deliverable D12/D13, doc. id. IMA6TR-061015-AEATUK10 (February 2007)
2. Kuijpers, A.H.W.M., Bekooy, M.E., Schaffner, J.C.: For noise reduction and preventative maintenance - Innovative grinding programme for Dutch high-speed rail line. Railway Gazette International, 345–348 (June 2006)
3. Dutch ministry of VROM, Reken- en Meetvoorschrift Geluidhinder 2006 – Bijlage 4 (December 2006)
4. ISO, prEN 15610 Railway applications - Noise emission - Rail roughness measurement related to rolling noise generation (2006)
5. Kuijpers, A.H.W.M.: Roughness monitoring for the HSL-Zuid with the ARRoW system: South section - April 2006 (initial state), report M+P.ISP.06.01.5 (July 2006)