1. Kisser R, Bauer R (2012) The burden of sports injuries in the European Union. Research report D2h of the project “Safety in Sports”, Vienna, Austrian Road Safety Board
2. American Society for Testing and Materials (2004) Standard specification for impact attenuation of surface systems under and around playground equipment, F1292-04, ASTM
3. American Society for Testing and Materials (2004) Standard specification for impact indoor wall/feature padding, F2440-04, ASTM
4. European Committee for Standardization (2009) Gymnastic equipment—General safety requirements and test methods, EN 913:2009, CEN
5. Collantes M (1990) Evaluation of the importance of using head injury criterion (HIC) to estimate the likelihood of head impact injury as a result of a fall onto playground surface materials. US Consumer Product Safety Commission, Washington