Epidemiology and control of nematodiasis in cattle : an animal pathology in the CEC Programme of Coordination of Agricultural Research, held at the Royal Veterinary and Agricultural University, Copenhagen, Denmark, February 4-6, 1980 - Nansen, P.; Jorgensen, R. Jess; Soulsby, E. J. L. (Current topics in veterinary medicine and animal science, 1981)