Journal of the South African Veterinary Association On-line version ISSN 2224-9435
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BWALA, D G et al.Efficacy of a genotype 2 Newcastle disease vaccine (Avinew®) against challenge with highly virulent genotypes 5d and 3d. J. S. Afr. Vet. Assoc. [online]. 2009, vol.80, n.3, pp. 174-178. ISSN 2224-9435.