1. Brown, D. G. & D. F. Johnson: Diseases of aged swine. J. Amer. vet. med. Ass. 1970, 156, 1283.
2. Christensen, N. O.: Impotentia coeundi in boars due to arthrosis deformans. Proc. XV Int. Vet. Congr., Stockholm 1953, Part I, 2, 742–745.
3. Duthie, I. F. & M. C. Lancaster: Polyarthritis and epiphyseolysis of pigs in England. Vet. Rec. 1964, 76, 263–272.
4. Grabell, I., H.-J. Hansen, S.-E. Olsson, K. Orstadius & E. Thal: Discospondylitis and arthritis in swine erysipelas. Acta vet. scand. 1962, 3, 33–50.
5. Grøndalen, T.: Osteochondrosis and arthrosis in pigs. I. Incidence in animals up to 120 kg live weight. Acta vet. scand. 1974, 15, 1–25.