1. Berggren, E. G., Li, M. X., Spännar, J. (2008): A new approach to the analysis and presentation of vertical track geometry quality and rail roughness. Wear, 265: 1488–1496
2. Dolan, J., Führer, C. (1981): Kovarianzanalyse bei zeitlich verschobenen Erregerprozessen mit Anwendung auf mehrachsige Schienenfahrzeuge. Interner Bericht IB 515-81/8, DFCLR, Oberpfaffenhofen
3. EN 13848-1 (2003): Track geometry quality – Characterization of track geometry
4. EN 14363 (2005): Railway applications – Testing for the acceptance of running characteristics of railway vehicles – Testing of running behaviour and stationary tests
5. EN 13848-5 (2008): Track geometry quality – Geometric quality levels