1. Lumbar disc lesions in retrospect and prospect;Barr;Clin Orthop,1977
2. Curent issues in chemonucleolysis;Benoist,1992
3. The cost of chemonucleolysis. A preliminary study;Bochu,1986
4. Lumbale skiveprolapser behandlet med kymopapain;Brautaset;Tidsskr Nor Laegeforen,1992
5. The failed back;Burton,1985