1. Branemark, P.-I., Ekholm, R., Lundskog, J.,et al., Tissue response to Chymopapain in different concentrations: animal investigations on microvascular effects. Clin. Orthop.67 (1969), 52–67.
2. Brown, J. E., Clinical studies on chemonucleolysis. Clin. Orthop.67 (1969), 94–99.
3. Feffer, H. L., Therapeutic intradiscal hydrocortisone, a long-term study. Clin. Orthop.67 (1969), 100–104.
4. Ford, L. T., Clinical use of chymopapain in lumbar and dorsal disc, lesions. An end-result study. Clin. Orthop.67 (1969), 81–87.
5. Garvin, P. J., Jennings, R. B., Smith, L.,et al., Chymopapain in experimental animals. Clin. Orthop.41 (1965), 204–223.