1. Technical rules on railway track for railway line with speed ≤ 250 km/h. (code: RFI TCAR ST AR 01 001 A, RFI, 30/11/01). Italian RFI (in Italian)
2. Technical rules on railway track for railway line with speed < 300 km/h (code: RFI TCAR ST AR 01 001, D RFI, 31/21/2013). Italian RFI (in Italian)
3. Tzanakakis K (2013) The railway track and its long term behaviour. Springer
4. Catalogue of the rail defects (1996) Italian RFI (in Italian)
5. UIC (2002) Code 712 R “Rail defects”, 4th ed