1. CALM Research Network, Research for a Quieter Europe, European Commission Research Directorate-General, www.calm-network.com, July 2002.
2. European Rail Research Advisory Council (ERRAC), Strategic Rail Research Agenda (SRRA), September 2002. www.unife.org
3. M. Jaecker, Strategies of the German Government for the Reduction of Railway Noise and their European Context, INTERNOISE 2000, Nice, France, 27–30 August, 2002.
4. Deutsche Bahn AG, Umweltbericht 2000, Berlin, 2000.
5. Deutsche Bahn AG, Umweltbericht 2002, Berlin, 2002.