1. Allen MA: Air force football injuries: a statistical study. JAMA 203: 1053 1055, 1966.
2. Allman FL Jr: Problems in the diagnosis and treatment of athletic injuries. J Louisiana Med Soc 117: 121-125, 1965.
3. Gurdjian ES, Webster, JE, Lissner, HR: Observations on the mechanism of brain concussion, contusion and laceration. Surg Gynec Obstet 101: 680-690, 1955.
4. Cartilage and ligamentous lesions of the knee in athletes