Brain tolerance to impact in football.

@article{Reid1971BrainTT,
  title={Brain tolerance to impact in football.},
  author={Stewart E Reid and J A Tarkington and Herbert M Epstein and T J O'Dea},
  journal={Surgery, gynecology & obstetrics},
  year={1971},
  volume={133 6},
  pages={929-36}
}