NFL Says Regular Season Concussions Rose 18%
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL hopes to reduce head injuries with helmet experiment
Football's Concussion Crisis Is Awash With Pseudoscience
New Player-Specific Football Helmets Could Reduce Head Trauma
Building a better helmet - The Globe and Mail
This 3D printed football helmet liner promises better protection
New Player-Specific Football Helmets Could Reduce Head Trauma
New Football Helmet Could Save the Sport
How Effective Are Football Helmets at Preventing Brain Injuries?
Future of football safety could come down to research in Riddell's suburban Chicago office
With concussions at forefront of minds, helmet designs more important