1. Blood, D. C., J. A. Henderson & O. M. Radostits: Veterinary Medicine. A textbook of the diseases of cattle, sheep, pigs and horses. 5th Ed., Baillière Tindall, London 1979, 1135 pp.
2. Bremner, I. & R. B. Marshall: Hepatic copper- and zinc-binding proteins in ruminants. 1. Distribution of Cu and Zn among soluble proteins of livers of varying Cu and Zn content. Brit. J. Nutr. 1974, 32, 283–291.
3. Brockman, R. P.: Concentration of copper in livers of Saskatchewan cattle at slaughter. Canad. vet. J. 1977, 18, 168–170.
4. Committee on Mineral Nutrition: Tracing and treating mineral disorders in dairy cattle. Centre for Agricultural Publishing and Documentation. Wageningen 1973, 27–31.
5. Dynna, O. & G. N. Havre: Interrelationship of zinc and copper in the nutrition of cattle. A complex zinc-copper deficiency. Acta vet. scand. 1963, 4, 197–208.