REFERENCES
- Brown, C. G. D., Stagg, D. A., Purnell, R. E., Kanhai, G. K. & Payne, R. C. (1973). Nature, London, 245, 101–103.
- De Martini, J. C. & Moulton, J. E. (1973). Journal of Comparative Pathology, 83, 281–298.
- Grootenhuis, J. G., Young, A. S., Dolan, T. T. & Stagg, D. A. (1979). Research in Veterinary Science, 27, 59–68.
- Hulliger, L. (1965). Journal of Protozoology, 12, 649–655.
- Hulliger, L., Wilde, J. K. H., Brown, C. G. D. & Turner, L. (1964). Nature, London, 203, 728–730.
- Malmquist, W. A., Nyindo, M. B. A. & Brown, C. G. D. (1970). Tropical Animal Health and Production, 2, 139–145.
- Pearson, T. W., Lundin, L. B., Dolan, T. T. & Stagg, D. A. (1979). Nature, London, 281, 678–680.
- Schein, E., Mehlhorn, H. & Warnecke, M. (1978). Protistologica, 14, 337–348.
- Stagg, D. A., Kanhai, G. K., Young, A. S. & Brown, C. G. D. (1976). Research in Veterinary Science, 20, 122–126.