1. Verordnung über die Lärmsanierung der Eisenbahnen, Der Schweizerische Bundesrat, 2001.
2. prEN ISO 3095:2001, Railway applications—Acoustics—Measurements of Noise Emitted by Railbound Vehicles, CEN European Committee for Standardization, January 2001.
3. TSI HS: Commission decision of 30 May 2002 concerning the technical specification for interoperability relating to the rolling stock subsystem of the trans-European high-speed rail system referred to in Article 6(1) of Directive 96/48/EC (2002/735/EC).
4. TSI-CR-NOISE: Trans European Conventional Rail System, Technical Specification for Interoperability, Subsystem Conventional Rail, Rolling Stock, Scope Noise, Aspect Noise Emitted by Freight Wagons, Locomotives, Multiple Units and Coaches, European Commission, Version EN01, Status NA, 24.11.2003.
5. F.G. de Beer, H.W. Jansen, M.G. Dittrich, TNO Report, STAIRRS Level 2 measurement methods: Indirect roughness and transfer function, TNO, 2002.