The Second Impact in Catastrophic Contact-Sports Head Trauma
JAMA 252:538-539, Saunders,R.L.,et al, 1984
Head Injury in Sport
BMJ 308:1620-1624, McLatchie,G.&Jennett,B., 1994
The National Football Head & Neck Injury Registry
JAMA 241:1477-1479, Torg,J.S.,et al, 1979