Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
Helmets And Mouthguards Don't Prevent Concussions, Doctors Agree
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
NFL Sees a Drop in Concussions, But Problems Linger
New Football Helmet Could Save the Sport
More padding the issue of concussions and better helmets
Helmet sticker may reduce concussions
Football helmets are creating more problems than they solve
The Coat of Arms Discussion: How are Serious Concussion Issues Changing Football?