1. Do Bicycle Safety Helmets Reduce Severity of Head Injury in Real Crashes?;Dorsch,1984
2. Bicycle Helmet Research;Elliott;Report to the Road Traffic Authority,1983
3. The effect of compulsory safety helmets on motorcycle accident fatalities;Foldvary;Aust. Road Res.,1964
4. Bicycle Accidents;Geelong Bike Plan;Technical Bulletin 2,1980
5. Trends in Helmet Usage Rates and Bicyclist Numbers Sustaining Head Injury—July 1981 to December 1985—Victoria;Healy,1986