The following are links to articles and case studies written by John Lloyd on helmet research and testing:
Motorcycle Helmet Testing
Biomechanical Evaluation of Motorcycle Helmets: Protection Against Head & Brain Injuries
What Every Rider Needs to Know About Motorcycle Helmets
Crash-Related Motorcycle Helmet Retention System Failures
Helmets – The Ultimate Protection?
Helmets Do Not Prevent Brain Injury
Motorcycle Helmets Provide Inadequate Protection Against Traumatic Brain Injury
Sport and Football Helmets
How Well Do Football Helmets Protect Against Concussion and Brain Injury?
Researchers Discover Objective Indicator of Concussion
New Helmet Technology Reduces Brain Injuries