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3. F.G. de Beer, H.W. Jansen, M.G. Dittrich, STAIRRS Level 2 measurement methods: indirect roughness and transfer function, STAIRRS Report, TNO-RPT-020079, July 2002.
4. European Directive: Directive 2002/49/EC of the European Parliament and of the Council of 25 June 2002 relating to the assessment and management of environmental noise, 2002.
5. European Commission: Commission Recommendation 2003/613/EC of 6 August 2003 concerning the guidelines on the revised interim computation methods for industrial noise, aircraft noise, road traffic noise and railway noise, and related emission data, 2003.