1. Bicyclists, helmets and head injuries: a rider-based study of helmet use and effectiveness;Wasserman;American Journal of Public Health,1988
2. Classification of injury severity by length of stay in hospital;Hobbs,1979
3. Bicycle accidents;Lind;Acta Chirugica Scandinavica,1986
4. Road Accident Great Britain 1988;Department of Transport,1989
5. Factors in the initiation of bicycle-motor vehicle collisions;Williams;American Journal of Diseases in Children,1976