1. Churchill, R. C. & Best, D. R. (1976).Australian Veterinary Journal,52, 487.
2. Luthman, J. & Jacobsson, S. O. (1982).Acta Veterinaria Scandinavica,23, 147–149.
3. Purnell, R. E. & Van Der Merwe, L. (1983). Proceedings of the Second International Conference on Malaria and Babesiosis, 19–22 September 1983, Annecy, France, p. 169.
4. Toutain, P. L. & Raynaud, J. P. (1983).American Journal of Veterinary Research,44, 1203–1209.