NFL Helmet Maker Loses Lawsuit Due to Lack of Warning
Virginia Tech puts youth football helmets to the test
Why Football Helmet Manufacturer Riddell Should Be Very Concerned About Concussion Litigation
Opinion 'League of Denial,' on concussions in the NFL, by Mark Fainaru-Wada and Steve Fainaru - The Washington Post
Guardian Caps Guardian Sports
NFL: Concussion issue a major headache for NFL – The Mercury
Mom blames football helmet over high school player's death
New football helmets hope to make a dent in reducing concussions
Helmet manufacturers, coaches try to protect players with advanced technology
3 in 4 Youth Football Players Have Ill-Fitting Helmets, Posing Concussion Risk
Report warned Riddell that no helmet could prevent concussions but NFL's helmet-maker marketed one as such anyway - ESPN
Dallas-Fort Worth high school helmets and concussions
Concussion-sensing helmets help HS footballers