1. Proceedings IRCOBI Conference;Aldman,1979
2. Medical Aspects of head protection for cyclists,1977
3. A review of riders and pedestrians in traffic collisions;Ashton,1976
4. Specifications for protective helmets;British Standard Institution,1977
5. The injury severity score of road traffic casualties in relation to mortality, time of death, hospital treatment time and disability;Bull;Accident Analysis and Prevention,1975