NFL offering research to help find safer and position-specific helmets - NBC Sports
Study Shows Concussion Risk 'Dependent on Helmet'
We Can Make Football Safer - Scientific American
University of Wisconsin football players downplay warnings while proof of brain injury — even from small hits — piles up - Wisconsin Watch
What Packers' Financials Reveal About NFL Concussion Settlement
Football Concussions Occur Mostly in Practice, Not Games
After a public fall, the face of NFL concussion denial resurfaces
Football helmets don't protect against concussion — and we're not sure what does
The NFL Needs to be More Proactive in Preventing Concussions
An Introduction to Sports Concussions - Frontline ER Houston
High-tech gear aims to lessen deadly risk of football concussions
What We've Learned From Two Years of Tracking NFL Concussions