1. U. Danneskiold-Samsøe, M.T. Kalivoda, U. Degn, F. Krüger, B. Barsikow, A study of European priorities and strategies for railway noise abatement, Main Report, Report 01.980, Copenhagen, 2001.
2. prEN ISO 3095, Railway applications—acoustics—measurement of noise emitted by rail bound vehicles, January 2001.