1. Chondromalacia patellae bland skolungdom;Hörding;Nord Med,1983
2. A clinic for athletic injuries;Newman;Proc R Soc Med,1969
3. Orava S. Exertion injuries due to sports and physical exercise. A clinical and statistical study of nontraumatic overuse injuries of the musculoskeletal system of athletes and keep-fit athletes Thesis University of Oulo 1980