1. Roizman, B. In: The Herpesviruses Vol. 1, Ed. B. Roizman, Plenum Press, New York and London, 1982, 7.
2. Alexander, R.A., Plowright, W. and Haig, D.A. Bull. Epiz. Dis. Afr. 1957, 5, 489–492.
3. Gibbs, E.P.J. and Rweyemamu, M.M. The Veterinary Bulletin. 1977, 47, 411–425.
4. Martin, W.B., Martin, B., Hay, D. and Lauder, I.M. Vet. Rec. 1966, 78, 494–497.
5. Martin, W.B., Martin, B. and Lauder, I.M. Vet. Rec. 1964, 76, 15–16.