The Effect of the 1992 California Motorcycle Helmet Use Law on Motorcycle Crash Fatalities and Injuries
JAMA 272:1506-1511, 1535, 1541994., Kraus,J.F.,et al, 1994
Motorcycle Helmet-Use Laws and Head Injury Prevention
JAMA 267:1649-1651, Sosin,D.M.&Sacks,J.J., 1992
Death & Serious Injury in Child Motorcyclists
BMJ 294:1259, Henderson,S.A.,et al, 1987