The link between head injuries and CTE in football, explained - Vox

The NFL and Concussions: The Overlooked Obvious - Bolts From The Blue

Concussions in Football: Pop Warner CTE Lawsuit Could Change Youth Sports

Study links youth football to greater risk of later health problems - The Boston Globe

University of Wisconsin football players downplay warnings while proof of brain injury — even from small hits — piles up - Wisconsin Watch

Theory of why the NFL wants to get rid of the kickoff - Dawgs By Nature

Study links youth football to greater risk of later health problems - The Boston Globe

NFL Players Twice as Likely to Get Concussions in Cold Weath

Targeting: The history, the current backlash and the future, Tiger Kickoff

NFL's new quarterback specific helmet design – United Brain Association

New Study May Lead to a Way to Diagnose CTE in Living Patients - The Ringer